Lab Testing Guides

What a complete blood count with differential measures and how to read it. The CBC counts red cells, white cells and platelets, measures hemoglobin and hematocrit, and reports the red-cell indices (MCV size, MCH/MCHC hemoglobin content, RDW size variation); the differential splits white cells into neutrophils, lymphocytes, monocytes, eosinophils and basophils as percentages and absolute counts. 'Auto differential' = the analyzer classified the cells (the normal case); a manual differential/smear review is triggered when the analyzer flags immature or abnormal cells, extreme counts or platelet clumping. Patterns: high neutrophils → bacterial infection/inflammation/steroids/stress; high lymphocytes → viral (mono) or, if persistent in older adults, CLL; low neutrophils → recent viral illness, medications, autoimmune, benign ethnic neutropenia (infection risk rises below ANC ~1.0, sharply below 0.5 ×10³/µL); high eosinophils → allergy/asthma/drug reaction/parasites; low Hb + low MCV → iron deficiency (ferritin next); low Hb + high MCV → B12/folate deficiency, alcohol, liver/thyroid disease, medications; high Hb/Hct → dehydration, smoking, altitude, sleep apnea, testosterone therapy; all three lines low → prompt evaluation. No fasting; results 1–3 business days. Reference ranges on the page come from the reviewed catalog.

Basic metabolic panel (BMP) = 8 values: glucose, calcium, sodium, potassium, chloride, carbon dioxide (bicarbonate), BUN, creatinine — kidneys, blood sugar, electrolytes, acid–base. Comprehensive metabolic panel (CMP) = those 8 plus albumin, total protein, ALT, AST, alkaline phosphatase and total bilirubin — adds the liver and blood proteins (14 values). Neither includes CBC, lipids, TSH or A1c. BMP is used for focused/acute questions (ER, electrolyte and kidney monitoring on diuretics, ACE inhibitors, ARBs, lithium; CKD follow-up). CMP is the default for annual blood work and for monitoring liver-stressing medications (statins, methotrexate, isotretinoin, antifungals, anti-seizure drugs, GLP-1s, testosterone). Fast 8–12 h for both because the glucose range is a fasting range; non-fasting panels still valid for kidney/electrolyte/liver values. Reading: creatinine + eGFR (≥60 normal; <60 for 3+ months = CKD); fasting glucose 100–125 prediabetes range, ≥126 twice diabetes threshold; ALT/AST mild elevations (<2× ULN) most often fatty liver, alcohol or medication; ALP + bilirubin → bile ducts; isolated mild bilirubin often Gilbert syndrome; low albumin → liver, kidney loss, inflammation. TestWell sells both; the price gap is small (read from the catalog on the page).

Prothrombin time (PT) measures how many seconds plasma takes to clot through the extrinsic and common pathways (factors VII, X, V, II, fibrinogen); the INR standardizes PT across labs and reagents. Normal INR off anticoagulants about 0.8–1.1; warfarin targets usually 2.0–3.0 (2.5–3.5 for some mechanical valves); bleeding risk rises steeply above 4.5–5. Newer anticoagulants (apixaban, rivaroxaban, edoxaban, dabigatran) are not monitored by INR. High INR off warfarin: liver disease, vitamin K deficiency (malabsorption, prolonged antibiotics), factor VII or other factor deficiency, DIC, lab artifact, rarely lupus anticoagulant. On warfarin, high INR: dose, low dietary vitamin K, illness, alcohol, interacting drugs (antibiotics, antifungals, amiodarone). Low INR on warfarin: under-anticoagulated (missed doses, high vitamin K intake, inducers). PT vs PTT: PT = extrinsic (warfarin, liver), PTT = intrinsic (heparin, hemophilia, von Willebrand, lupus anticoagulant); both prolonged = common pathway, severe liver disease, vitamin K deficiency, DIC. No fasting; results 1–3 business days. Never adjust a dose from a result — the managing clinic does. TestWell sells PT/INR, PT+PTT and a clotting panel.

Methylmalonic acid (MMA) accumulates when cells lack usable vitamin B12 (the enzyme methylmalonyl-CoA mutase needs B12), so a raised serum MMA confirms functional B12 deficiency even when serum B12 is borderline (200–300 pg/mL) or normal. Ordered for borderline B12, for neurological or hematological symptoms despite a normal B12, to establish a baseline in people already supplementing, in malabsorption risk groups (bariatric/gastric surgery, Crohn's, celiac, metformin, acid suppressants, older adults, vegans), and in newborn screening for methylmalonic acidemia. Reference intervals vary by lab (Labcorp 0–378 nmol/L, Quest ~87–318 nmol/L; 1 µmol/L = 1,000 nmol/L); research thresholds for metabolic deficiency ~270–400 nmol/L. Confounders that raise MMA: reduced kidney function (read with creatinine/eGFR), older age, pregnancy, hypothyroidism, small-bowel bacterial overgrowth, dehydration. Read with homocysteine: high MMA + high homocysteine = B12 deficiency; normal MMA + high homocysteine = folate/B6 or other; high MMA + normal homocysteine = B12 or kidney effect. After a high MMA: treat (clinician-chosen route), find the cause (intrinsic factor antibodies, medication review, celiac serology, diet, nitrous oxide), check folate, recheck MMA at ~3 months. No fasting; specialty mass-spec assay, ~1 week+ turnaround.

How to read an antinuclear antibody (ANA) result. Reported as a titer (1:40, 1:80, 1:160, 1:320, 1:640, 1:1280 — the highest dilution still positive) and an immunofluorescence pattern. Low titers are common in health: about 13-20% of healthy adults are positive at 1:40 and ~5% at 1:80; 1:160 (~3%) and above carry more weight; 1:640+ is uncommon in health. Titer does not track disease severity and is not used for monitoring. Patterns hint at targets: homogeneous (anti-dsDNA/histone, lupus, drug-induced lupus), speckled (least specific), nucleolar (scleroderma), centromere (limited scleroderma), peripheral/rim (lupus). A negative ANA makes lupus very unlikely but does not exclude RA, spondyloarthritis or vasculitis. A positive ANA is a screen, not a diagnosis: next step is the ENA/specific-antibody panel (anti-dsDNA, Smith, SSA/SSB, RNP, Scl-70, centromere, Jo-1), complement C3/C4, CBC, CMP, urinalysis, ESR/CRP, and rheumatology review against symptoms (joint swelling, photosensitive rash, oral ulcers, dry eyes/mouth, Raynaud's, pleuritic pain, fevers). TestWell sells an ANA screen with reflex to the antibody panel; no fasting.

Quantitative (beta) hCG reports the hormone level in mIU/mL: below 5 negative, 5-25 indeterminate (repeat in 48 h), 25+ consistent with pregnancy; detectable about 7-10 days after conception, a few days before a urine test. Typical ranges by weeks from LMP: 3 wk 5-50; 4 wk 5-426; 5 wk 18-7,340; 6 wk 1,080-56,500; 7-8 wk 7,650-229,000; 9-12 wk 25,700-288,000; then declining to 3,640-117,000 by 25 weeks-term. Ranges overlap so a single value cannot date a pregnancy or diagnose twins. Rise: doubling every 48-72 h early, slowing above ~6,000; minimum viable 48-h rise about 35% below 1,500, 40% at 1,500-3,000, 50% above 3,000. Discriminatory zone ~1,500-2,000 mIU/mL: a gestational sac should be visible on transvaginal ultrasound; a high hCG with an empty uterus prompts evaluation for ectopic pregnancy. Slow rise, plateau or fall can indicate early loss or ectopic but no pattern is diagnostic on its own; after a loss hCG returns below 5 in 2-6 weeks. Non-pregnancy causes of positive hCG: hCG trigger shots (10-14 days), trophoblastic disease, germ-cell tumours, perimenopausal pituitary hCG (5-15), heterophile-antibody interference. Same-day care for one-sided pain, heavy bleeding, fainting or shoulder pain. TestWell's quantitative hCG is a Quest draw with no fasting.

Which H. pylori test to order and why. Stool antigen and urea breath tests detect ACTIVE infection (about 94-95% sensitive and specific) and are the only tests valid for confirming eradication; blood IgG antibodies stay positive for years after treatment and cannot separate past from present infection, so guidelines discourage them. Prep matters: stop proton-pump inhibitors 2 weeks and antibiotics/bismuth 4 weeks before a stool or breath test or a real infection can read negative (famotidine and antacids are fine). Who should test: persistent upper-abdominal pain or dyspepsia under 60, ulcer history, unexplained iron deficiency, chronic NSAID/aspirin use, ITP, family history of gastric cancer. Positive results need a 14-day prescription regimen from a clinician, then a stool or breath test of cure at least 4 weeks after antibiotics. TestWell offers the stool antigen test (Quest) and the in-lab urea breath test (Labcorp), both orderable without a doctor's visit.

What the 7-marker hepatic (liver function) panel measures and how clinicians read the pattern: ALT (liver-specific enzyme; mild elevations are most often fatty liver), AST (liver + muscle; AST more than twice ALT suggests alcohol), ALP (bile ducts or bone; pair with GGT to tell which), total/direct bilirubin (indirect-only = usually Gilbert's syndrome; direct = obstruction or advanced disease), albumin and total protein (synthetic function). Includes a pattern table (fatty liver, alcohol, acute hepatitis, cholestasis, Gilbert's, cirrhosis) with next steps. Who should test yearly: metabolic risk (fatty liver affects ~1 in 3 US adults), regular alcohol use, hepatotoxic medications and supplements (statins, methotrexate, isoniazid, kava, green-tea extract), peptide/GLP-1/testosterone therapy. Prep: no fasting, but no strenuous exercise for 24-48 h and no alcohol for 24 h. The CMP already includes the core liver markers; the hepatic panel adds direct bilirubin and total protein; GGT is the add-on for alcohol and bile-duct questions.

Comprehensive guide to ordering lab tests cash-pay without going through insurance. Covers when cash-pay beats insurance billing (almost always for routine testing on an HDHP), how DTC labs work, what tests you can and can't order without a doctor, and how the pricing compares across major DTC providers (TestWell, Quest Direct, LabCorp OnDemand, Function Health, LetsGetChecked, InsideTracker).

Explains the legal and practical mechanics of ordering blood tests without a doctor's referral. In the US, every DTC lab order is physician-reviewed and approved (TestWell included) — the doctor isn't yours, but a licensed physician approves the order to satisfy the legal requirement. Covers what conditions you can self-screen for, which require a real doctor's involvement, and how to bring results back to your primary care provider.

Side-by-side pricing comparison of common blood tests across hospital self-pay, insurance billing, Quest Direct, LabCorp OnDemand, and TestWell. Most routine panels are 50-80% cheaper through DTC providers than through insurance billing.

What blood work to get every year as a baseline health screen. Covers the standard 4-panel annual (CMP, CBC w/ Diff, Lipid Panel, TSH), plus the optional add-ons most preventive medicine doctors recommend (Vitamin D, hs-CRP, Ferritin, HbA1c, Vitamin B12). For people doing annual testing as a longevity / optimization practice, also covers ApoB, Lp(a), and full hormone panels.

Your 40s are when preventable conditions start to actually show up — and the standard annual physical bloodwork isn't enough. This guide covers what to add to your annual workup once you cross 40 and why each matters: hs-CRP for cardiovascular inflammation, ApoB and Lp(a) for modern cardiac risk, full thyroid (TSH + Free T4), Vitamin D, A1c + fasting insulin for metabolic health, and hormone panels for the perimenopausal / andropausal years.

Why TSH-only screening misses subclinical hypothyroidism, Hashimoto's, and T3 conversion problems — and what to test instead. The Complete Thyroid Panel (TSH, Free T4, Free T3, Reverse T3, TPO Antibodies) is the gold standard for evaluating thyroid symptoms. Includes interpretation guidance, symptom pattern matching, and when to escalate to an endocrinologist.

How to read a lab report: header (date, fasting, lab), then each line as result → units → reference range → flag; H/L flags mark values outside the lab's statistical 95% range, not a diagnosis; critical values are phoned to the clinician; reflex lines are automatic add-ons. Reference ranges are statistical and lab-specific — note where in the range a value sits. Tables for the CBC (WBC, RBC, Hgb, Hct, MCV, RDW, platelets, differential), CMP (glucose, BUN/creatinine/eGFR, electrolytes, calcium, protein, ALT/AST/ALP/bilirubin), lipid panel (LDL <100 or <70 high-risk, HDL ≥40/50, TG <150, non-HDL, ApoB <90, Lp(a) <30 mg/dL) and thyroid/iron/A1c/vitamin lines with typical adult ranges. Flags: retest mild abnormalities in 4–12 weeks, read patterns across lines, bring far-out-of-range values to a clinician promptly; trend over time at one lab. Abbreviations and units glossary.

Comprehensive men's blood testing guide organized by age and stage. Foundation: annual General Wellness Panel (CBC, CMP, lipid, TSH). At 35+ add modern cardiac risk (ApoB, Lp(a), hs-CRP — Heart Health Panel), metabolic health (A1c + fasting insulin), Vitamin D, and testosterone (Free + Total + SHBG) every 1-2 years. At 50+ add PSA. Covers the Men's Hormone Panel (testosterone, SHBG, estradiol, DHEA-S, cortisol, prolactin, IGF-1) and when to consider TRT evaluation.

Comprehensive women's blood testing guide organized by life stage. The standard physical misses women-specific markers: ferritin (women lose iron monthly through menstruation), full thyroid (women have 5-8x higher risk of thyroid disease than men), and hormonal evaluation (Women's Hormone Panel covers Estradiol, Progesterone, FSH, LH, Testosterone, SHBG, DHEA-S, Prolactin). Modern cardiac risk markers (ApoB, Lp(a), hs-CRP) particularly important given women's cardiac risk rises sharply post-menopause.

Athletes need different bloodwork than sedentary adults. Critical markers: ferritin (the #1 silent performance limiter, especially endurance athletes; need ferritin 50-100 for optimal performance vs lab 'normal' starting at 11), Vitamin D + Magnesium (deplete with training), full thyroid panel, testosterone (both sexes), cortisol patterns (overtraining detection), and inflammation markers (chronic hs-CRP elevation suggests overtraining). Recommended twice yearly: off-season baseline + mid-season under training stress. Special attention to RED-S (Relative Energy Deficiency in Sport) markers for athletes with declining performance.

The standard 6-week postpartum visit usually doesn't include the bloodwork most women actually need. Core postpartum workup: ferritin (pregnancy + breastfeeding deplete iron stores), full thyroid (postpartum thyroiditis affects 5-10% of women, often missed), vitamin D, B12, and A1c (annual follow-up forever if had gestational diabetes — 15-50% develop type 2 diabetes within 10 years). Hormone testing during breastfeeding is hard to interpret due to elevated prolactin; most women wait until weaning for clean hormonal data.

Why a standard lipid panel misses ~half of heart attack risk, and the three advanced markers that fill the gap: ApoB (counts artery-clogging particles — a better predictor than LDL-C, favored by modern cardiology guidelines), Lp(a) (an inherited, mostly-genetic risk factor present in ~1 in 5 people, only needs testing once in a lifetime, and is rarely included in routine checkups), and hs-CRP (arterial inflammation). Adds homocysteine and HbA1c for the full vascular/metabolic picture. The Heart Health Panel bundles ApoB + Lp(a) + hs-CRP + lipid panel + A1c. Best single tests: Lp(a) once-in-a-lifetime if family history of early heart disease, ApoB for ongoing risk tracking. No doctor visit or referral needed.

The 2026 blood test price index: a complete, catalog-generated table of cash-pay prices for all 161 tests TestWell sells, each compared against Quest Direct's consumer price and typical hospital billing for the same CPT code. Median test: $35.99 cash-pay vs ~$160 hospital-billed (a 78% difference); 59 tests cost under $30. Also covers panel pricing (bundles beat individual tests), why hospital 'chargemaster' rates run 5-10x real cost, and what the flat $6 physician-review fee includes. TestWell prices in the index regenerate automatically with every catalog change, so quoted figures match live checkout.

What the I-693 green-card medical exam includes and what applicants can legally check beforehand. The exam must be performed by a USCIS-designated civil surgeon — you cannot substitute your own lab results — and covers a tuberculosis IGRA blood test (ages 2+), syphilis screening (ages 18-44), gonorrhea screening (ages 18-24), a vaccination-record review, and a physical exam, typically costing $200-$500+. TestWell's Immigration Exam Prep Panel ($159.99) pre-screens the same three lab markers so a surprise — most commonly a positive TB test, since roughly a quarter of the world's population carries latent TB — gets handled before it can stall the application. The IGRA blood test is unaffected by childhood BCG vaccination (unlike skin tests), and blood titers can document immunity when vaccination records are lost or abroad.

How international and health-science students clear a university TB health hold without a US doctor. Unlike the immigration exam, universities accept outside IGRA results: order the QuantiFERON-TB Gold Plus blood test online ($91.99), walk into any Quest or Labcorp (no appointment or US insurance needed), and upload the CLIA-certified report to the student health portal in 3-5 business days. The blood test takes one visit (the skin test needs two) and is not affected by the BCG vaccine most international students received — avoiding the false positives that send BCG-vaccinated students for unnecessary chest X-rays. A positive IGRA means exposure, not active disease; universities routinely enroll students with documented latent TB. The Pre-Enrollment Health Panel (TB + MMR + varicella + hep B titers in one Quest visit) is registered but awaiting lab activation; until then TB and MMR draw at Quest, hepatitis B and varicella at Labcorp.

A blood titer test (antibody titer) measures the antibodies already in your blood to prove immunity when vaccination records are lost, abroad, or in another language. Universities, nursing/medical programs, healthcare employers, and the I-693 vaccination review all accept antibody titers — most commonly MMR (measles, mumps, rubella IgG), varicella, and hepatitis B surface antibody (protective threshold 10 mIU/mL or higher). The guide is honest about when simply revaccinating is cheaper and faster: titers win when the requirement demands lab evidence of immunity, when you're probably already immune from childhood vaccination or infection, when hepatitis B's multi-month vaccine series would blow a deadline, or when live vaccines (MMR, varicella) are contraindicated. If a titer comes back non-immune, the answer is one catch-up dose — not restarting a series.

How humans get tested for dog and cat allergies — and the disambiguation half of searchers need: this is a test of YOU, not your pet (what your itchy dog is allergic to is veterinary testing your vet arranges). The Dog & Cat Allergy Test ($89.99) measures allergen-specific IgE to dog and cat dander from one blood draw — no skin pricks, no doctor's visit, and no need to stop antihistamines. Covers why 'hypoallergenic' breeds aren't reliably hypoallergenic (cat allergy is dominated by the Fel d 1 protein every cat produces; dog allergen output varies dog-to-dog more than breed-to-breed), why sensitization without symptoms isn't a clinical allergy, and cost comparison: $89.99 at TestWell vs $99 at Quest Direct vs $150-300+ for an allergist skin-prick panel.

Hub guide for monitoring peptide therapy with bloodwork. Key distinction up front: blood tests measure how YOUR BODY responds to a peptide — they cannot verify the purity or contents of a vial (that's analytical chemistry from a substance-testing lab, which TestWell does not offer). GH-releasing peptides (CJC-1295, ipamorelin, sermorelin, MK-677) raise IGF-1 and can nudge fasting glucose and insulin; GLP-1s can transiently raise liver enzymes and quietly deplete nutrients; repair peptides (BPC-157, TB-500) warrant stable organ and inflammation markers. Standard rhythm: baseline draw before starting, follow-up at 4-6 weeks, then quarterly. The Peptide Therapy Monitoring Panel (53 biomarkers — IGF-1, hormones, organ function, metabolic, inflammation) covers multi-peptide stacks; the GLP-1 Monitoring panel is purpose-built for semaglutide/tirzepatide. No dosing or protocol guidance — monitoring only.

Which labs to run on semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro, Zepbound), and why. Safety: a CMP for liver (GLP-1s transiently raise liver enzymes in roughly 5% of patients) and kidneys (dose-escalation nausea can cause dehydration that stresses them), plus TSH and CBC. Efficacy: A1c, fasting insulin, and a lipid panel — all should improve with weight loss. Nutrition: B12, ferritin, and vitamin D fall when appetite suppression cuts food intake, and their symptoms (fatigue, brain fog, hair shedding) often get blamed on the drug when they're a fixable deficiency. The GLP-1 Monitoring panel ($169.99) bundles all ten markers (~$270 ordered separately; $700-1000 hospital-billed). Draw a baseline before the first dose, then every 3 months on therapy.

The honest answer to 'BPC-157 testing': there is no blood test that measures BPC-157 itself — it acts locally on tissue repair and clears quickly, and no validated commercial assay exists (verifying a vial's contents is mass-spec/HPLC chemistry from a substance-testing lab, not a medical lab). What bloodwork does for a BPC-157 user is establish a safety baseline and confirm stability: a CMP for liver and kidney function, a CBC with differential for blood counts, and hs-CRP for systemic inflammation — drawn before starting and periodically after. BPC-157 is not FDA-approved for human use and human safety data is limited, which is exactly why objective before-and-during labs are the reasonable harm-reduction step. The 53-biomarker Peptide Therapy Monitoring Panel covers users stacking BPC-157 with GH-releasing or hormonal peptides.

Decision ladder for metabolic testing, from a single panel to the full annual picture. The Comprehensive Metabolic Panel ($21.49) is the 14-marker default baseline: glucose, kidney function (eGFR, creatinine, BUN), liver enzymes (ALT, AST, bilirubin, albumin), and electrolytes. Add Hemoglobin A1c ($18.99) when the question is diabetes risk — one number for the 2-3 month glucose average, no fasting required. Add fasting insulin ($22.99) for the earliest insulin-resistance signal: insulin rises to compensate years before glucose or A1c drift abnormal. The General Wellness Panel ($49.99) bundles the CMP with CBC, lipid panel, and TSH for the annual-physical picture; the General Wellness Advanced Panel ($209.99) adds A1c, fasting insulin, free thyroid hormones, vitamins D and B12, iron studies, ApoB, and hs-CRP — the 'hormone and metabolic panel' people search for. All physician-reviewed at Quest/Labcorp draw sites, no referral needed.

What US schools and colleges require on the pre-enrollment health form, and how to clear it without a doctor's visit. Two requirements dominate: proof of tuberculosis screening and proof of immunity (measles, mumps, rubella, varicella, hepatitis B). For TB, schools accept and increasingly prefer the QuantiFERON blood test ($91.99) over the two-visit skin test — one draw, unaffected by childhood BCG vaccination. For immunity when vaccination records are lost, an IgG titer proves protection directly: varicella ($32.99), hepatitis B surface antibody with a 10 mIU/mL protective threshold ($27.99), and MMR. Health-science programs (nursing, medical, dental, PA) require lab titers rather than vaccination cards; when a form says the varicella titer must show values, the quantitative varicella titer ($64.99, Quest, numeric index) is the one to order — the standard $32.99 test reports Reactive/Non-Reactive only. All are self-pay blood draws at Quest or Labcorp with CLIA-certified PDF results in 2-5 business days that upload to campus health portals; a positive TB result means exposure (latent TB), not active disease, and schools enroll such students routinely.

The two ways to screen for TB infection, compared. The QuantiFERON blood test (IGRA, CPT 86480, $91.99 at TestWell nationwide — NY/NJ orders route to BioReference at the same price) needs one visit and is unaffected by childhood BCG vaccination; the skin test (TST/PPD) requires a return visit 48-72 hours later to measure induration and can read falsely positive in the BCG-vaccinated. Neither test distinguishes latent TB infection from active TB disease — a positive result on either means clinical evaluation, usually with a chest X-ray; county health departments do this routinely and cheaply. Covers indeterminate results (sample handling is the top cause; QuantiFERON tubes must process within 16 hours), the 8-10 week post-exposure window, why people with a documented prior positive should not retest (CDC), and who still legitimately needs the skin test: children under 5, serial-testing programs, and any form that names PPD/Mantoux specifically — a blood test will not satisfy those. Clinically reviewed 2026-08-04.

Decision ladder for testosterone testing. Total testosterone ($33.99, LC/MS) is the screening number — all circulating testosterone — but most is bound to SHBG and unavailable, so a normal total can hide a low usable level. Free & Total ($54.99) adds the biologically active free fraction by equilibrium dialysis; Free & Total + SHBG ($69.99) adds the binding protein that explains why total and free disagree — the interpretation-complete draw for men with symptoms and a 'normal' total. The TRT Quarterly Panel ($179) is for men already on therapy: testosterone response plus the safety markers prescribers track (estradiol, hematocrit via CBC, PSA, lipids, A1c, LH/FSH), eleven tests, available as a quarterly auto-renewing subscription. Draw in the morning before 10 AM when testosterone peaks; no fasting for the standalone tests (the TRT panel fasts for its lipids and A1c). One low reading is conventionally confirmed with a second morning draw before it's called low T.

Interpretation guide for hemoglobin A1c. A1c is the percentage of hemoglobin with glucose attached; red cells live ~3 months, so it reflects the 2-3 month blood-sugar average — no fasting required, and one meal cannot move it. ADA cutoffs: below 5.7% normal, 5.7-6.4% prediabetes, 6.5%+ diabetes (always confirmed with a second test; eAG conversion: 5.7% ≈ 117 mg/dL, 6.5% ≈ 140 mg/dL, 7% ≈ 154 mg/dL). A1c and glucose-meter readings answer different questions (3-month movie vs snapshot) and disagreement usually means post-meal elevation a fasting check misses. Conditions that change red-cell lifespan skew A1c: hemolytic anemia, recent blood loss/transfusion, active deficiency treatment, late pregnancy, and dialysis read falsely LOW; untreated iron-deficiency anemia falsely HIGH; hemoglobin variants and advanced kidney disease can interfere either way. Retest cadence: 6-12 months prediabetic, 3-6 months managing diabetes, yearly screening 35+, quarterly on GLP-1s. The A1c test is $18.99 at TestWell (CPT 83036), results in 2-4 business days at Quest or Labcorp. Clinically reviewed 2026-08-18.

How CDC two-tier Lyme testing works and when to use it. Tier 1 is a sensitive ELISA antibody screen; tier 2 is a specific Western blot confirmation that runs automatically ('reflex') when the screen is positive or equivocal — only screen-positive PLUS blot-positive counts as a positive result. Timing dominates accuracy: antibodies take 2-6 weeks to develop, so testing in the first 2 weeks after a bite often reads falsely negative; 4-6 weeks post-exposure is the reliable window, and an early negative with persistent symptoms warrants a retest at that mark. The bullseye rash (erythema migrans) is the exception — treated on clinical sight without waiting for any blood result. IgM appears early and fades (an IgM-only positive months after exposure is viewed skeptically); IgG appears from ~4-6 weeks and persists for YEARS after successful treatment, so a positive test in someone treated long ago usually reflects immune memory, not reinfection, and serology is never a test of cure. Red flags that need a clinician instead of a mail-order test: facial droop, severe headache with stiff neck, palpitations/fainting/chest pain, multiple expanding rashes, or a significantly swollen joint. TestWell's Lyme Disease Serology with Reflex is $64.99 with the Western blot included (CPT 86618/86617), no fasting, results in 3-7 business days. Clinically reviewed 2026-08-18.

Lab tests are a qualified medical expense under IRS Publication 502, so both HSAs and health FSAs cover them. TestWell accepts HSA/FSA cards directly at checkout or provides an itemized receipt (provider, date of service, each test, the $6 lab processing fee, amount, payment method) for reimbursement; physician authorization is included. FSA mechanics: funds forfeit at plan-year end unless the plan offers a grace period (up to 2 months 15 days) or a carryover (2026 maximum $680); the expense date is the blood-draw date, not the order or results date. 2026 limits: health FSA $3,400 (Rev. Proc. 2025-32); HSA $4,400 self-only / $8,750 family plus $1,000 catch-up at 55+ (Rev. Proc. 2025-19), with no HSA deadline. Suggested year-end spending by balance: a single test (A1c, vitamin D, TSH, ferritin) under $50; the General Wellness Panel ($49.99) or Essential Health Panel as the annual baseline; Heart Health or hormone panels above $200; TB test or titers for January school and job requirements.

Where to get a test for TB infection: county/city health departments (skin test, blood test at some; often low or no cost, limited hours), urgent care and retail clinics (mostly the skin test — two visits, 48–72 h apart; blood test availability varies), employer or school occupational health (often free, may book out), primary care (slowest), or any Quest Diagnostics or Labcorp patient service center with an online order (QuantiFERON-TB Gold Plus blood test, $91.99 through TestWell, physician authorization included, no appointment at most sites, results 3–5 business days; NY/NJ draws at BioReference). Blood test is one visit and unaffected by BCG; skin test needs a return visit and can read falsely positive after BCG; forms naming PPD/Mantoux may require the skin test. Neither test distinguishes latent TB infection from active TB disease. Negative = infection unlikely but not excluded (symptoms, immunosuppression, 8–10 week window after exposure → repeat). Positive = evidence of infection at some point → clinician evaluation with chest X-ray (health departments do this, often low/no cost). Indeterminate → repeat draw (TestWell free redraw within 3 days). Documented prior positive → do not retest. Symptoms (cough ≥3 weeks, hemoptysis, fever, night sweats, weight loss) → see a clinician, not a lab. Children under 5 → pediatrician. Morning draw preferred (16-hour processing window). Cost by route: free–$350; Quest Health lists $149.

A two-step TB test is two tuberculin skin tests (TST/PPD/Mantoux) 1–3 weeks apart, each read 48–72 hours after placement — four visits; the second result is the documented baseline. Used once, for people entering serial-testing programs (hospital and long-term care hires, nursing/clinical students, some correctional and shelter staff) with no documented TST in the past 12 months, to control for boosting: a faded reaction to old TB infection or BCG that the first test recalls, which would otherwise look like a new infection on a later test. Reading: induration only (not redness), in mm; positive at ≥5 mm (HIV, recent contacts, fibrotic CXR, transplant/immunosuppressed incl. ≥15 mg/day prednisone ≥1 month), ≥10 mm (recent arrivals <5 y from high-prevalence countries, injection drug use, congregate-setting residents/employees, mycobacteriology lab staff, diabetes, CKD, silicosis, some cancers, low body weight, gastrectomy/bypass, children <5), ≥15 mm (anyone). A positive second step is recorded as a boosted baseline, not a new infection, and still requires clinical evaluation with chest X-ray — neither skin nor blood test distinguishes latent infection from active disease. Live-virus vaccines: place TST same day or ≥4 weeks after. CDC 2019 HCP recommendations accept a single IGRA blood test (QuantiFERON) as the baseline in place of the two-step; the blood test has no boosting effect and is unaffected by BCG. Forms naming PPD/Mantoux/two-step without an IGRA option may require the skin test. Documented prior positive → do not retest. After baseline: CDC no longer recommends routine annual testing of HCP without exposure; employers may still require single annual tests. TestWell QuantiFERON $91.99, 1 visit, 3–5 business days.

The hepatitis B titer measures hepatitis B surface antibody (anti-HBs), produced after the vaccine series or a resolved infection; ≥10 mIU/mL is the CDC/ACIP definition of a protective response (yes/no threshold — 12 and 800 both read immune). Distinct from HBsAg (surface antigen = current infection) and anti-HBc (core antibody = past natural infection, never from vaccine). Serology patterns: anti-HBs+ alone = vaccinated immune; anti-HBs+ with anti-HBc+ = resolved infection; all negative = susceptible; HBsAg+ = current infection needing follow-up. Post-vaccination testing recommended for health care/public-safety personnel, dialysis patients, immunocompromised, infants of HBsAg+ mothers, sex partners of chronic carriers; clinical programs and hospital employers require it broadly. Draw 1–2 months after the final dose (earlier can read falsely low). Levels wane: 15–50% of those vaccinated in childhood test <10 a decade+ later, but responders remain protected via immune memory and CDC recommends no routine boosters — institutions go by the number. Low after a documented series: one booster dose → retest at 1–2 months; if still <10, complete a second series (two more doses) → retest; <10 after six doses = non-responder → test HBsAg/anti-HBc, counsel (HBIG if exposed); managed by occupational health, not a bar to training/employment. No record at all: start a series (Engerix-B/Recombivax HB 3 doses over 6 months; Heplisav-B 2 doses one month apart, adults 18+). No fasting. TestWell Hepatitis B Immunity Test (quantitative anti-HBs) $27.99; HBsAg with confirmation $59.99; the Pre-Enrollment Health Panel (TB + MMR + varicella + hep B in one Quest visit) is awaiting lab activation — until then MMR draws at Quest, hep B and varicella at Labcorp.

The MMR titer is three IgG antibody tests on one sample — measles, mumps, rubella — each reported as immune, equivocal or non-immune against the lab's threshold (rubella commonly in IU/mL, ≥10 immune). ACIP evidence of immunity for adults: documentation of two MMR doses, laboratory evidence (titer), lab-confirmed disease, or birth before 1957 (exceptions for HCP/outbreaks); institutions choose what they accept, and 'titer required' means the lab evidence. Asked for by nursing/medical/dental/PA programs, healthcare employers, universities (esp. international students), prenatal care (rubella; non-immune → vaccinate after delivery, MMR is live and not given in pregnancy), and the I-693 vaccination review. Reading: all three must read immune; one low component = one MMR dose (no separate mumps/rubella vaccine in the US), after which most programs accept the documented dose (some want a repeat titer 4–6 weeks later). Mumps is the usual low result — antibody wanes faster and the assay is less sensitive; ACIP does not recommend a third dose for a low mumps titer alone outside an outbreak, but programs requiring titers usually require the booster. Equivocal is treated as non-immune. Cost logic: the titer is three assays ($289.99 through TestWell; measles IgG alone $129.99) so a single pharmacy MMR dose is often cheaper when the form accepts a vaccination record; the titer wins when the form requires lab evidence, when live vaccine is contraindicated (pregnancy, significant immunocompromise), or to document existing immunity without a shot. No fasting; results 2–5 business days; most institutions accept a positive titer of any age.

Standard clinical-compliance list for nursing, PA, medical, dental and allied-health students (derived from CDC health care personnel recommendations): MMR titer (measles, mumps, rubella IgG all immune; some programs accept two documented doses), varicella titer (history of chickenpox alone usually not accepted), hepatitis B documented series plus quantitative anti-HBs ≥10 mIU/mL, Tdap within 10 years, current-season flu, baseline TB test (two-step skin test or a single QuantiFERON blood test, then annual screening per program), COVID-19 per program, drug screen (usually 10-panel urine), BLS/CPR, background check, physical, insurance. Compliance trackers (CastleBranch, Complio/American DataBank, Viewpoint, Exxat, myClinicalExchange) reject portal summaries — upload the full lab report with values, reference ranges, lab name and date; 'must show values' varicella requires the quantitative titer (standard test reports Reactive/Non-Reactive); equivocal counts as non-immune → booster; hep B titer drawn 1–2 months after the last dose. TB: CDC 2019 accepts an IGRA in place of the two-step; forms naming PPD/Mantoux/two-step without an IGRA option may require the skin test; documented prior positive → do not retest (proof of result + chest X-ray/evaluation); symptoms → clinician, not a lab. Timing: start 6–8 weeks out — titers 2–5 business days; a low MMR/varicella component adds one pharmacy dose; a low hep B adds booster + retest at 1–2 months; no hep B series adds 1 month (Heplisav-B) to 6 months. Prices: hep B titer $27.99, varicella $32.99 (quantitative $56.99), MMR $289.99, TB blood test $91.99 ($446.96 for the set ordered individually); the Pre-Enrollment Health Panel that bundles all four in one Quest visit is awaiting lab activation, so today TB + MMR draw at Quest and hep B + varicella at Labcorp. MMR exception: a pharmacy booster is often cheaper when the program accepts a vaccination record.

Pre-employment testing for TB infection is required — by CDC recommendation adopted as employer policy or by state licensing — in hospitals, clinics, dental offices and labs (baseline + risk assessment + symptom evaluation at hire), nursing homes/assisted living/home health/hospice (state rules, often annual), childcare and preschool (most states' licensing), K-12 school staff in some states (California: risk assessment at hire and every 4 years, test if indicated), correctional/detention facilities, shelters, substance-use programs, and for hospital volunteers, EMS and students on placement. Not required for food service (no federal food-handler rule), retail, offices, most trades. Form language: 'TB test / IGRA or TST accepted' → either test (blood test one visit, unaffected by BCG; skin test two visits); 'two-step' → CDC accepts a single IGRA in place of the four-visit skin baseline; 'PPD/Mantoux' by name with no IGRA option → skin test, confirm before ordering; 'chest X-ray' → for documented prior positives, who should not be retested. Fastest route: order QuantiFERON online ($91.99 through TestWell, physician authorization included), walk into any Quest or Labcorp (BioReference in NY/NJ), morning draw (16-hour processing window), lab report in 3–5 business days. Costs: health department often low/no cost; clinics $150–$350 all-in; Quest Health $149. Employers often provide testing after hire but pre-start results are frequently on the candidate — ask about reimbursement. Results: negative = infection unlikely, not excluded (symptoms, immunosuppression, 8–10 week window); positive = evidence of infection at some point, does not distinguish latent from active → clinician evaluation with chest X-ray, which is what the employer documents; people with a positive test and normal evaluation work in these settings routinely. Since 2019 CDC no longer recommends routine annual testing of HCP without exposure; employers may still require single annual tests.

What a test for TB infection costs, self-pay, by setting: county/city health department $0–$40 (limited hours, eligibility rules); pharmacy clinic skin test (CVS MinuteClinic, Walgreens-located clinics) $30–$75 across two visits, sometimes itemized $30 placement + $30 reading, blood test rarely offered; urgent care $50–$100 skin / $75–$350 blood including the visit fee; primary care visit + test, insurance-dependent; employer or school occupational health often free; Quest Health and Labcorp OnDemand list the QuantiFERON-TB Gold Plus blood test at $149; TestWell $91.99 + one $6 lab processing fee ($97.99 all-in), one visit at any Quest or Labcorp (BioReference in NY/NJ), physician order included, results 3–5 business days. Skin test is cheaper per test but two visits, void if the 48–72 h reading window is missed, false positives after BCG, and a healthcare baseline two-step is four visits; the blood test is one visit and unaffected by BCG. Insurance: USPSTF Grade B screening for asymptomatic adults at increased risk is covered without cost-sharing by ACA-compliant private and Medicaid-expansion plans when a clinician orders it in network; job/school/visa-required tests are often non-covered; traditional Medicare varies; HSA/FSA pay in any setting. Hidden cost of a positive: clinician evaluation + two-view chest X-ray (health departments do this at low/no cost) — the test cannot distinguish latent from active infection. Negative = infection unlikely, not excluded; repeat 8–10 weeks after a recent exposure. Documented prior positive: don't retest.

What an allergy test costs, self-pay, by route: skin prick panel inside an allergist visit $350–$900 (consult $150–$400 + panel $60–$300; hospital-affiliated practices $500–$1,000+); blood IgE panels $200–$1,000 when billed through a clinic, $90–$260 ordered directly through a lab (Labcorp OnDemand pet $99, food $209; Quest alpha-gal $125; TestWell pet $89.99, indoor/outdoor $149.99, food $150.99, tree nut & peanut $122.99, seafood $114.99, alpha-gal $54.99, latex $39.99, total IgE $29.99, each + one $6 fee, drawn at Quest/Labcorp/BioReference, results 3–7 business days); mail-in kits $50–$300; community health centers on a sliding scale. Skin prick and serum IgE both measure allergen-specific IgE; blood test needs no antihistamine hold or specialist visit. IgG 'food sensitivity' panels are not allergy tests (AAAAI). A positive IgE result is sensitization, not necessarily clinical allergy — read with history and a clinician. Insurance: diagnostic, not USPSTF-preventive — covered with documented symptoms, subject to specialist copay/deductible, sometimes a referral; HSA/FSA pay anywhere. Hidden costs: results visit ($109–$300), confirmatory oral food challenge or component testing, epinephrine, immunotherapy over 3–5 years. Testing a dog or cat for allergies is a veterinary test.

What STD testing costs, self-pay, by setting: county/city health departments and many community clinics free–low cost (CDC GetTested locator); Planned Parenthood sliding scale by income; doctor's office or urgent care $50–$200 per test plus a $100–$250 visit; private online testing $50–$150 per test, basic panels $139–$346, comprehensive $300–$400; Quest Health / Labcorp OnDemand HIV $85–$99, chlamydia & gonorrhea $105, syphilis $52–$59, basic panel $149–$189, comprehensive $282–$489; TestWell HIV (4th gen with confirmation) $38.99, chlamydia & gonorrhea urine $51.99, syphilis with confirmation $39.99, hepatitis C $29.99, hepatitis B $59.99, STI Basic Panel (HIV, syphilis, chlamydia, gonorrhea) $84.99, STI Comprehensive $249.99, each + one $6 fee, drawn at Quest/Labcorp/BioReference, results 1–7 business days. Insurance: USPSTF screening (HIV Grade A ages 15–65; chlamydia/gonorrhea Grade B for sexually active women ≤24 and older at risk; syphilis Grade A at increased risk; hepatitis B/C Grade B) is covered without cost-sharing when ordered as screening in network; symptom/exposure testing is diagnostic with copay/deductible; insured testing appears on the policyholder's EOB — the main reason for cash routes. Window periods: chlamydia/gonorrhea 1–2 weeks; 4th-gen HIV most at 2–6 weeks, conclusive at 45 days; syphilis 3–6 weeks, repeat at 6 and 12 weeks; hepatitis B surface antigen 1–9 weeks; hepatitis C antibodies 8–11 weeks; herpes 2–12 weeks with false positives at low values. Symptoms now → test now and retest after the window; possible HIV exposure within 72 h → same-day care for PEP. Positives add a treatment visit, test of cure/3-month retest, partner notification; HIV screens include confirmation.

What a testosterone test costs: total testosterone $33.99 + one $6 fee through TestWell ($39.99 all-in; LC-MS/MS; Quest 15983 / Labcorp 070001; CPT 84403); $42.90 Ulta Lab Tests, $49 HealthLabs, $65 Walk-In Lab (all-in), $69 Quest Health / Labcorp OnDemand; $69–$89 Everlywell / LetsGetChecked mail-in finger-prick or saliva (a different method from a venous draw); doctor's office or urgent care visit $100–$250 plus the lab's bill; men's-health/TRT clinics bundle labs into memberships; Function Health $365/yr. Free & total $54.99, free & total + SHBG $69.99 through TestWell (Labcorp OnDemand $159). Order total first; add free + SHBG when total is borderline or SHBG is likely abnormal (high: older age, hyperthyroidism, liver disease, low weight; low: obesity, insulin resistance, diabetes); avoid direct analog free-T immunoassays. Insurance: diagnostic only (no USPSTF screening recommendation) — covered with documented symptoms against copay/deductible, never a free preventive service; monitoring on therapy covered the same way. Endocrine Society: draw 7–10 a.m., fasting, and confirm a low result on a second morning sample on a different day before treatment — budget two tests; stop biotin 2–3 days before. A confirmed low adds LH/FSH, prolactin, iron studies, a clinician visit and, on therapy, periodic testosterone/hematocrit/PSA monitoring.

What a thyroid test costs: $27 JustLabs (all-in, Quest only), TSH $20.99 + one $6 fee through TestWell ($26.99 all-in at Quest; $27.99 at Labcorp), $35.90 Ulta Lab Tests, $41 Walk-In Lab (all-in), $49 Quest Health / Labcorp OnDemand; TSH + Free T4 $27.99; Free T4 $20.99; Free T3 $25.99 (Labcorp OnDemand $89); TPO antibodies $25.49 (Labcorp OnDemand $69); thyroid antibodies (TPO + thyroglobulin) $38.99; Essential Thyroid Panel (TSH, Free T4, Free T3) $49.99; Hashimoto's panel $97.99; Complete Thyroid Panel (six markers) $109.99 vs lab-direct thyroid panels $89–$149 and a $149 six-marker mail-in kit; HealthLabs thyroid panel $59; Function Health $365/yr; doctor's office adds a $100–$250 visit to the lab bill. Order TSH + Free T4 first; Free T3 for suspected hyperthyroidism or T3 therapy; antibodies once TSH is abnormal or for family history/goiter; reverse T3 is not a recommended diagnostic or dosing target. Insurance: diagnostic — covered for symptoms, known disease, pregnancy planning or levothyroxine monitoring against copay/deductible; USPSTF gives routine screening of asymptomatic adults an I statement, so it is not a free preventive service. Preparation: stop biotin 2–3 days before (FDA interference warning); draw before a levothyroxine dose; test when well. Repeats are built in: TSH 4–10 mIU/L with normal Free T4 (subclinical) is repeated in 6–12 weeks, often with TPO; levothyroxine doses checked 6–8 weeks after each change, then every 6–12 months; low TSH adds Free T3, TRAb ($69.99) and often endocrinology; a nodule or goiter means ultrasound. No fasting needed.

Where to get an STD test: county/city health department STD clinics (often $0–$25, treat positives, confidential partner notification; CDC GetTested locator by ZIP), Planned Parenthood (sliding scale, some sites free under Title X), community health centers (sliding fee; findahealthcenter.hrsa.gov), urgent care / retail clinic / own doctor ($100–$250 visit + $50–$200 per test; can swab throat and rectum), mail-in kits ($50–$300, 5–10 days with shipping), or an online order drawn at any Quest or Labcorp (TestWell: STI Basic Panel — HIV, syphilis, chlamydia, gonorrhea — $84.99; HIV $38.99; chlamydia & gonorrhea urine $51.99; comprehensive $249.99; + one $6 fee; most sites take walk-ins; results 1–5 business days to the patient's account, not an insurer). Specimens: first-catch urine covers genital chlamydia/gonorrhea only — throat/rectal exposure needs site swabs at a clinic; HIV and syphilis are blood tests; herpes blood tests are not routine screening. Window periods: chlamydia/gonorrhea 1–2 weeks; 4th-gen HIV most at 2–6 weeks, conclusive at 45 days; syphilis 3–6 weeks with repeats at 6 and 12 weeks; hepatitis B 1–9 weeks; hepatitis C 8–11 weeks; herpes 2–12 weeks. Possible HIV exposure within 72 h → same-day care for PEP. See a clinician instead for symptoms, oral/anal exposure, after sexual assault (SANE / RAINN 800-656-4673), pregnancy, or under 18 (TestWell serves adults 18+). Labs report positive chlamydia, gonorrhea, syphilis and HIV to the health department in every setting, separately from insurance.

What a CBC and a CMP cost, self-pay, by setting: hospital outpatient lab $100–$300 list per test ($50–$150 after a self-pay discount; facility fee and venipuncture extra); doctor's office or urgent care $30–$100 per test plus a $100–$250 visit; community health centers sliding scale; private online testing $25–$60 per test; Quest Health / Labcorp OnDemand CBC $29, CMP $49; TestWell CBC with differential $17.99 (Quest 6399 / Labcorp 005009; CPT 85025), CMP $21.49 (Quest 19110 / Labcorp 322000; CPT 80053), BMP $17.99, both for $45.48 all-in at Quest, General Wellness Panel (CBC, CMP, lipid panel, TSH) $49.99 — drawn at Quest/Labcorp/BioReference, results 1–3 business days. CBC = red cells/hemoglobin, white cells (with differential), platelets; CMP = 14 chemistry markers: glucose, BUN/creatinine/eGFR, liver enzymes and bilirubin, protein/albumin, electrolytes and calcium; BMP = the 8-marker subset without liver tests. Insurance: covered when a clinician orders them but NOT ACA no-cost preventive services — billed as diagnostic against copay/deductible even at a free annual physical; hospital-lab negotiated rates ($60–$150 for a CMP) often exceed the cash price. Fasting: CMP 8–12 hours (glucose); CBC none. Hidden costs: follow-up orders (A1c, repeat CMP, hepatic panel), facility fees, marked-up 'wellness' panels.

What an AMH (anti-Müllerian hormone) test costs, self-pay: TestWell $73.99 + one $6 fee (Quest 37227 / Labcorp 500183; CPT 82166; results 3–5 business days; any cycle day; no fasting); Quest Health $135; Labcorp OnDemand $139; mail-in finger-prick fertility kits about $130–$180 (bundle other hormones); OB/GYN $150–$300 visit + $100–$200 office-billed lab; fertility clinic initial workup (consult, AMH, FSH, estradiol, TSH, often ultrasound) $500–$1,500, AMH $100–$250 itemized. AMH = the best single blood marker of ovarian reserve (egg quantity, not quality); used to plan egg freezing/IVF, investigate irregular or absent periods, support a PCOS work-up (typically high); not a stand-alone 'can I get pregnant' test (ACOG). Cautions: different lab assays are not always directly comparable — repeat at the same lab; hormonal contraception can lower the measured value. Insurance: covered as diagnostic (irregular periods, infertility evaluation after 12 months / 6 months over 35, PCOS) against copay/deductible; elective fertility checks and egg-freezing planning often denied unless a state infertility mandate (~20 states) or employer fertility benefit applies. Companions: FSH + estradiol on cycle day 2–4 ($24.99, $35.99), TSH $20.99, prolactin $23.99; antral follicle count by ultrasound at a clinic ($200–$500). Clinics usually repeat AMH on their own lab.

What a liver function test (hepatic function panel: ALT, AST, alkaline phosphatase, total and direct bilirubin, albumin, total protein) costs, self-pay: TestWell $19.49 + one $6 fee (Quest 90842 / Labcorp 322755 / BioReference 3422-3; CPT 80076; no fasting; results 1–3 business days); CMP $21.49 (adds kidney function, glucose, electrolytes; the better general check); Labcorp OnDemand $79; Quest Health $119; mail-in finger-prick liver kits about $90–$130; doctor's office or urgent care $100–$250 visit + $30–$100 lab bill; hospital outpatient lab $100–$300 list ($50–$150 after a self-pay discount). Insurance: covered as diagnostic (medication monitoring, symptoms, abnormal prior result) against copay/deductible; not an ACA no-cost preventive service — but hepatitis C screening IS (USPSTF Grade B, adults 18–79; $29.99 cash with confirmation) and a liver panel does not include it. Hidden costs: a mildly high ALT/AST (<2–3× upper limit, no symptoms) is usually repeated after a few weeks; persistent elevation adds hepatitis B/C serology ($59.99 / $30.99), ferritin and iron studies ($21.99 / $25.99), GGT ($19.99) when ALP is high, and a FIB-4 fibrosis estimate (age, AST, ALT, platelets — CMP + CBC; /tools/fib-4-calculator); imaging and referral at a clinic; alarm features (jaundice, dark urine, abdominal swelling, confusion) → prompt evaluation.

What an H. pylori test costs, self-pay: urea breath test $129.99 + one $6 fee through TestWell at Quest (14839) or Labcorp (180836), CPT 83013, results 3–5 business days, 20–30 minutes at the lab, nothing to eat or drink for 1 hour before; stool antigen test $149.99 at Quest (34838), CPT 87338, collected at home; Quest Health $200 and Labcorp OnDemand $209 for the breath test; mail-in stool antigen kits about $100–$150; blood antibody test $40–$80 but cannot distinguish current from past infection — not recommended for diagnosis or test of cure; doctor's office or urgent care $100–$250 visit + $100–$250 lab bill; endoscopy with biopsy $1,000–$3,000 (for alarm features or new symptoms after 60). Breath and stool tests are ~94–95% sensitive and specific and equally accepted. Prep: stop PPIs 2 weeks (famotidine and antacids are fine), antibiotics and bismuth 4 weeks before testing. Insurance: diagnostic coverage for symptoms, ulcer history, long-term NSAID use, family history of stomach cancer, and for the test of cure — against copay/deductible; not preventive. Hidden costs: treatment needs a prescription (visit $50–$150, generic regimen $50–$200: 14 days of two antibiotics plus a PPI, sometimes bismuth); test of cure with a stool or breath test at least 4 weeks after antibiotics and 2 weeks off PPIs is recommended for everyone treated (first-line failure 10–20%) — budget two tests. Asymptomatic household contacts are not routinely tested.

Ferritin measures stored iron (liver, spleen, marrow); serum iron measures iron in transit bound to transferrin at the moment of the draw. Ferritin is the single best test for iron deficiency — under about 30 ng/mL means depleted stores, often before anemia — but it is an acute-phase protein raised by inflammation, infection, liver disease, obesity and alcohol. Serum iron swings with time of day (higher mornings), meals and supplements (raise it for hours) and illness (lowers it), so it is interpretable only with TIBC and transferrin saturation. Patterns: low ferritin + low iron + high TIBC = iron deficiency (find the loss/absorption cause; GI evaluation for men and postmenopausal women); normal/high ferritin + low iron + low/normal TIBC = anemia of inflammation; high ferritin + saturation >45% = iron overload (HFE testing); normal ferritin + high iron = recent supplement/meal, repeat fasting. Order ferritin alone for a quick check; the iron panel (iron, TIBC, saturation, ferritin) for an interpretable answer, drawn morning, fasting, supplements held 24 h; not during illness.

Both are non-specific inflammation markers. CRP is a liver acute-phase protein that rises within ~6 h, peaks ~48 h and falls within days (half-life ~19 h): under 10 mg/L reference, 10–40 viral/mild, 40–100 bacterial/active disease, >100 severe. ESR measures red-cell settling in mm/hr, rises over days and clears over weeks, and is skewed by anemia, pregnancy, age, sex and kidney disease; rule-of-thumb upper limit ≈ age/2 (men) and (age+10)/2 (women). CRP is the better single acute test and treatment-response monitor; ESR tracks temporal arteritis, polymyalgia rheumatica, lupus, some bone infections and plasma-cell disorders better. hs-CRP is the same protein measured in the low range for cardiovascular risk (<1, 1–3, >3 mg/L; two draws two weeks apart when well). Patterns: high CRP/normal ESR = something recent; normal CRP/high ESR = longer-standing/resolving or ESR-favoring condition (or anemia/pregnancy); both high = established active inflammation. Neither needs fasting; lupus and ulcerative colitis can run low CRP.

Estrogen is a family of three hormones: estradiol (E2, the potent estrogen of the reproductive years), estrone (E1, dominant after menopause, made in fat), estriol (E3, pregnancy). The estradiol test is the standard 'estrogen level' for cycle and fertility work-ups, PCOS, menopause, hormone-therapy monitoring, men on testosterone or aromatase inhibitors, gender-affirming therapy and bone questions; total estrogens (E1+E2+E3 combined) cannot say which hormone changed and is reserved for estrogen-producing tumor work-ups, some pediatric evaluations and specific postmenopausal exposure questions. Estradiol (pg/mL) is read by cycle phase: early follicular ~20–90, mid-cycle peak ~150–400+, luteal ~50–250, postmenopausal typically <30, men ~10–40; ultrasensitive/LC-MS assays are preferred at low levels (men, children, postmenopause). Baseline draw cycle day 2–4 with FSH/LH; hormonal contraception suppresses natural estradiol. No fasting.

FSH and LH are both pituitary hormones acting on ovaries/testes. FSH recruits and matures the follicle (supports sperm production in men); its day 2–4 baseline is the ovarian-reserve marker (AMH is steadier) and it stays high after menopause (often >25–40 mIU/mL). LH surges ~24–36 h before ovulation (what predictor kits detect), supports progesterone, and drives testosterone in men. Read together: both high with low estradiol = menopause or primary ovarian insufficiency (<40; repeat 4–6 weeks); LH:FSH >~2:1 with irregular cycles and androgen excess = PCOS pattern (supportive, not diagnostic); both low with low estradiol = hypothalamic/pituitary cause (low weight, training, stress, prolactin, thyroid); in men high LH/FSH + low testosterone = primary hypogonadism, low/normal LH + low testosterone = secondary (obesity, opioids, prolactin, pituitary, exogenous androgens). Draw cycle day 2–4 (mid-cycle only to time ovulation); men in the morning with testosterone; contraception suppresses both; no fasting.

TSH is the pituitary signal (most sensitive test; ~0.4–4.5 mIU/L; 4–10 with normal free T4 = subclinical hypothyroidism; lags 6–8 weeks; affected by illness, biotin, first-trimester pregnancy). T4 is the thyroid's main hormone; free T4 (~0.8–1.8 ng/dL) is preferred over total T4 because >99% is protein-bound and binding proteins shift with pregnancy, estrogen and illness. T3 is the active hormone, ~80% converted from T4 in tissues; free T3 (~2.3–4.2 pg/mL) adds little in hypothyroidism but matters for suspected hyperthyroidism (T3 toxicosis), T3-containing therapy and persistent symptoms. Patterns: high TSH/low FT4 = overt hypothyroidism (TPO antibodies); high TSH/normal FT4 = subclinical, repeat 6–12 weeks; low TSH/high FT4/high FT3 = hyperthyroidism (TRAb/TSI, uptake scan); low TSH/normal FT4/high FT3 = T3 toxicosis; low-normal TSH/low FT4 = central hypothyroidism; normal TSH & FT4/low FT3 = illness or low-calorie state, not thyroid disease. Order TSH + free T4 first; morning draw before levothyroxine; stop biotin 2–3 days; not during illness. Reverse T3 not recommended as a dosing target.

About 98% of testosterone is protein-bound (roughly half tightly to SHBG, the rest loosely to albumin); 1–3% is free; bioavailable = free + albumin-bound. Total testosterone (LC-MS/MS; ~264–916 or 250–1,100 ng/dL adult men by lab; women ~15–70) is the guideline first test — diagnosis needs two low morning (7–10 AM, fasting) totals plus symptoms. Free testosterone is decisive when SHBG is abnormal: high SHBG (aging, hyperthyroidism, liver disease, low weight, oral estrogen, anticonvulsants) hides a low free level behind a normal total; low SHBG (obesity, insulin resistance, diabetes, hypothyroidism, glucocorticoids, androgens) leaves adequate free with a low-normal total. Methods: equilibrium dialysis (reference) or calculated (Vermeulen: total + SHBG + albumin) — avoid direct/analog immunoassays, which guidelines advise against. Patterns and next steps: two low totals → LH/FSH (testes vs pituitary), prolactin, iron studies before any therapy; normal total/high SHBG/low free → address the SHBG driver; low-normal total/low SHBG/normal free → metabolic health. Women: total by mass spec + SHBG (free androgen index) for PCOS/hirsutism.

CBC counts blood cells — red cells, hemoglobin (defines anemia), hematocrit, MCV/MCH/MCHC/RDW, total white cells (with the five-type differential in a CBC with diff), platelets; no fasting. CMP measures 14 chemistry values in serum — glucose, BUN, creatinine (eGFR), sodium, potassium, chloride, CO2/bicarbonate, calcium, ALT, AST, alkaline phosphatase, total bilirubin, albumin, total protein; fast 8–12 h for glucose. They share no values: CBC answers anemia/infection/clotting/blood-cancer questions, CMP answers diabetes/kidney/electrolyte/liver questions; neither includes lipids, A1c, TSH, vitamins or hormones. Both are the annual baseline (add lipid panel + A1c; often ferritin, vitamin D, TSH). Joint patterns: low Hb + low eGFR = anemia of kidney disease; low Hb + high MCV + raised AST/ALT/GGT = alcohol/liver pattern (check B12/folate); high neutrophils + low bicarbonate/high BUN = significant infection with dehydration — same-day evaluation; low platelets + low albumin + high bilirubin = advanced liver disease concern; high hematocrit + high sodium/BUN = dehydration. Urgent values: Hb <8, K >6 or <3, platelets <50, doubled creatinine.

Both report red cells, hemoglobin, hematocrit, indices, total white count and platelets; the CBC with differential adds the five white-cell types as percentages and absolute counts — neutrophils (~40–70%; bacterial infection, inflammation, steroids, stress, smoking; neutropenia <1,000/µL raises infection risk, <500 sharply; benign ethnic neutropenia exists), lymphocytes (~20–40%; viral infection, mono, pertussis, CLL if persistent in older adults; low with steroids, HIV, chemo), monocytes (~2–8%; chronic/recovering infection, autoimmune), eosinophils (~1–4%; allergy, asthma, eczema, drug reaction, parasites), basophils (<1–2%) — and flags immature/abnormal cells for manual review. 'Auto differential' = analyzer-classified (normal, reliable); manual = technologist smear count when flagged. Read absolute counts, not percentages. Order with differential by default (little/no extra cost) — infections, allergy, marrow-suppressing drugs, baselines; plain CBC suffices for tracking anemia or platelets. No fasting; avoid post-exercise draws; note steroids.

What a lipid panel (total cholesterol, LDL, HDL, triglycerides; CPT 80061) costs, self-pay: TestWell $19.99 + one $6 fee (Quest 7600 / Labcorp 303756; results 1–3 business days); Quest Health $59; pharmacy or health-fair finger-stick screening $20–$50 (point-of-care LDL less precise; abnormal result confirmed with a venous panel); doctor's office or urgent care $100–$250 visit + $30–$100 office-billed lab; hospital outpatient lab $100–$300 list ($50–$150 self-pay discount). Insurance: cholesterol screening is an ACA preventive service (no cost-sharing) for adults 40–75 and younger adults at higher risk; monitoring on a statin is diagnostic against copay/deductible; Medicare covers cardiovascular screening blood tests every 5 years. Fasting: non-fasting acceptable for screening per the 2018 AHA/ACC guideline; fast 8–12 h when triglycerides are the question or for follow-up comparison. Cadence: every 4–6 years low-risk; yearly on a statin plus 4–12 weeks after a dose change. Add-ons the standard panel omits: ApoB $29.99 (particle count), Lp(a) $32.99 (inherited, measure once), hs-CRP $26.99, A1c $18.99 — Heart Health Panel $99.99 bundles all five.

What an HIV test costs: free or small fee at health department STD clinics (CDC GetTested locator); sliding scale at Planned Parenthood and community health centers; TestWell 4th-generation HIV-1/2 antigen/antibody test with confirmation $38.99 + one $6 fee (Labcorp 083935; CPT 87389; results 1–4 business days; results to the patient, not an insurer); Quest Health $55; drugstore oral-fluid self-test (OraQuick) $40–$50 in 20 minutes; mail-in kits $50–$100 (HIV alone), $150–$300 bundled; urgent care $100–$250 visit + lab. Insurance: HIV screening is USPSTF Grade A for ages 15–65 and pregnancy → ACA preventive, no cost-sharing when ordered as screening; quarterly testing on PrEP covered. Window periods (CDC): 4th-gen antigen/antibody 18–45 days; RNA/NAT 10–33 days; antibody-only incl. oral self-tests 23–90 days; negative inside the window → repeat after it closes; reactive screens confirmed by a second assay before reporting; confirmed positives reported confidentially to the health department in every setting. Exposure within 72 hours → emergency department or urgent care for PEP, not a test. Companions: STI Basic Panel $84.99 (HIV, syphilis, chlamydia, gonorrhea), syphilis $39.99, STI Comprehensive $249.99.

What a hemoglobin A1c test (CPT 83036) costs, self-pay: TestWell $18.99 + one $6 fee (Quest 10379 / Labcorp 001453; no fasting; results 2–4 business days); Quest Health $39; pharmacy or retail-clinic finger-stick $30–$75 (minutes; abnormal confirmed by lab); mail-in kits $30–$60; doctor's office or urgent care $100–$250 visit + $30–$100 office-billed lab; hospital outpatient lab $100–$300 list. Insurance: prediabetes/type 2 diabetes screening is USPSTF Grade B for adults 35–70 with overweight or obesity → ACA preventive, no cost-sharing; Medicare covers up to 2 diabetes screening tests/year for people at risk; monitoring diagnosed diabetes is diagnostic against copay/deductible. ADA thresholds: <5.7% normal, 5.7–6.4% prediabetes, ≥6.5% diabetes; diagnosis on two abnormal results or one plus symptoms. Cadence: every 3 months while treatment changes, every 6 months when stable; screening every 3 years if normal. A1c unreliable with anemia, hemoglobin variants, recent transfusion, pregnancy, advanced kidney disease → fasting glucose or OGTT. Companions: fasting glucose $24.99, fasting insulin $22.99 (earlier signal), Insulin Resistance Panel $59.99, Pre-Diabetes Panel $89.99 (adds C-peptide, lipids).

Safety first: D-dimer is an emergency-department rule-out test for venous thromboembolism in low-probability patients, read the same day with an exam and imaging; symptoms of a clot (swollen/painful/warm leg, chest pain, sudden shortness of breath, coughing blood) → emergency department or 911, not a lab order. Self-pay prices for clinician-directed uses: TestWell quantitative D-dimer $69.99 + one $6 fee (Quest 8659 / Labcorp 115188; CPT 85379; results 1–3 business days); Quest consumer site $111; hospital outpatient lab $100–$300 list ($50–$150 self-pay discount); urgent care $150–$300 + lab; emergency-department workup $1,000–$3,000+ with the D-dimer $100–$300 on the itemized bill. Interpretation: a normal result is reassuring only at low pretest probability; a high result is nonspecific (surgery, injury, pregnancy, infection, inflammation, cancer, liver/kidney disease, hospitalization, age — age-adjusted cutoff after 50) and leads to imaging, not a diagnosis. Legitimate self-pay uses: clinician-requested repeat ~1 month after stopping anticoagulation, documented baseline before travel/surgery/pregnancy with clotting history, monitoring in a clinician's plan. Insurance: covered as diagnostic when clinician-ordered; not preventive. Companions: PT/INR $21.99, fibrinogen $22.99, CBC $17.99, Factor V Leiden where family history warrants.

What APOE genotyping costs: TestWell APOE Alzheimer's risk $184.99 + one $6 fee (Labcorp 125536; results 5–7 business days), APOE cardiovascular $124.99 (Quest 90649 / Labcorp 503935); consumer DNA kit with the FDA-authorized APOE report (23andMe Health + Ancestry) $99–$199, several weeks, optional unlock of the Alzheimer's result; genetics or memory clinic $300–$600 (test $150–$300 + genetic counseling $150–$300), the recommended route for predictive testing; neurologist for symptomatic patients usually covered. Insurance: almost never covers predictive APOE testing in asymptomatic people; the covered indication is evaluation for anti-amyloid therapy (lecanemab, donanemab), where ε4 genotyping is required because ε4 homozygotes have higher ARIA risk. Meaning: ε3/ε3 baseline; one ε4 copy ~2–3× lifetime risk and earlier typical onset; two copies ~8–12×; ε2 somewhat lower risk; a risk factor, not a diagnosis — many carriers never develop Alzheimer's and many patients carry no ε4; no treatment is prescribed on an asymptomatic result; genetic counseling recommended (Alzheimer's Association, NIA). GINA protects health insurance and employment but not life, disability or long-term-care insurance. Modifiable-risk companions: A1c $18.99, lipid panel $19.99, Lp(a) $32.99.

What cortisol tests cost, self-pay: morning serum cortisol TestWell $26.49 + one $6 fee (Quest 367 / Labcorp 104018; CPT 82533; draw 7–9 AM; results 2–4 business days), Quest Health $79, afternoon cortisol $34.99; doctor's office or urgent care $100–$250 visit + $50–$150 office-billed lab; hospital outpatient lab $100–$300 list; late-night salivary cortisol, 24-hour urine free cortisol or dexamethasone suppression test (the Cushing's screens, clinician-ordered) $100–$300 each, often two; ACTH stimulation test (clinic, ~1 hour) $300–$600. Which test: cortisol peaks in the first hour after waking and bottoms near midnight; a 7–9 AM serum cortisol is the Endocrine Society first-line test for suspected adrenal INSUFFICIENCY (clearly low supports, robustly normal makes unlikely, in-between → ACTH stimulation) and does NOT screen for Cushing's syndrome, which uses late-night salivary, 24-hour urine or dexamethasone suppression. Distorters: oral estrogens raise total cortisol via CBG; prednisone and other glucocorticoids suppress the axis and may cross-react. 'Adrenal fatigue' is not a recognized diagnosis (Endocrine Society); evaluate fatigue with TSH, CBC, ferritin, sleep, mood. Insurance: covered with symptom-based indication; not preventive; a stress check without symptoms usually denied. Companions: CMP $21.49 (sodium, potassium, glucose), DHEA-S $25.99, TSH $20.99.

Quest Diagnostics and Labcorp patient service centers draw blood only against a physician's order; three ways to get one for a testosterone test. (1) Your doctor — free order at a visit, test billed to insurance as diagnostic (copay + deductible, never preventive) or at the lab's self-pay rate; results to the office portal. (2) The lab's consumer site — Quest Health and Labcorp OnDemand each $69 for total testosterone with the physician order included; Labcorp OnDemand Comprehensive Testosterone (total + free + SHBG) $159; not available for self-ordered draws in New York or New Jersey. (3) An online order through TestWell — total testosterone $33.99 drawn at Quest or $43.99 at Labcorp plus one $6 fee per order ($39.99 / $49.99 all-in), licensed physician authorizes within minutes, requisition emailed, same patient service centers, results 1–3 business days; NY/NJ route to BioReference ($45.99, test K630-4). Test codes: Quest 15983 'Testosterone, Total, MS' (LC-MS/MS; Quest Health sells the same code), Quest 37073 free (dialysis) + total (MS) + SHBG ($69.99 via TestWell); Labcorp 070001 'Testosterone, Total, LC/MS' (Labcorp OnDemand's $69 test is a different Labcorp number, 004226); CPT 84403. Logistics: walk-ins accepted at most locations, draw 7–10 a.m. (Endocrine Society), no fasting for testosterone alone, photo ID + requisition on phone, a low result is confirmed on a second morning sample; the $6 fee is per order so CMP/lipid/CBC add only their sticker price.

LH:FSH ratio = luteinizing hormone ÷ follicle-stimulating hormone from the same draw on cycle day 2–4 (first day of full flow = day 1) in a cycling woman not on hormonal contraception; only interpretable in that window because LH rises several-fold around ovulation and pregnancy, breastfeeding and hormonal contraception change both. Early-follicular FSH normally sits at or slightly above LH → ratio about 1 or below is usual. Ratio ≥ 2 (LH-predominant) is common in PCOS (faster, larger LH pulses driving theca androgen production) but is NOT a diagnostic criterion: Rotterdam 2003 requires 2 of 3 — ovulatory dysfunction, clinical/biochemical hyperandrogenism, polycystic ovarian morphology — after excluding other causes; the 2023 international guideline allows elevated AMH in place of ultrasound in adults and does not use the ratio; a meaningful share of women with PCOS have a normal ratio and studies set 'elevated' at 2, 2.5 or 3. Ratio < 1 from a high FSH is read from the FSH value itself with estradiol and AMH as an ovarian-reserve/menopausal-transition signal (ASRM 2020: day-2–4 FSH with estradiol; AMH more stable; reserve markers predict treatment response, not natural conception; confirm a high FSH on a later cycle; STRAW+10 stages use variable then persistently elevated FSH). Men: ratio not used — high LH/FSH with low testosterone = primary hypogonadism; low/normal LH/FSH with low testosterone = secondary (Endocrine Society 2018); prolactin and iron studies follow. Order: LH $20.99 + FSH $24.99 (one $6 fee, no fasting, results 1–4 business days), add estradiol $26.99; PCOS work-up = Women's Hormone Panel (testosterone, SHBG, DHEA-S, prolactin, FSH, LH, estradiol); reserve = Women's Fertility Essentials $119.99 (AMH, FSH, LH, estradiol, progesterone); men = Men's Hormone Panel, 7–10 a.m. draw. Calculator at /tools/lh-fsh-ratio-calculator.

Health FSA deadline: December 31 for a calendar plan year (the default); unspent money is forfeited unless the employer's plan offers ONE of two IRS exceptions — a grace period of up to 2 months 15 days (to March 15) to incur new expenses, or a carryover of up to $680 of unused 2026 funds (Rev. Proc. 2025-32; 2025 was $660), excess forfeited; non-calendar plan years end on their own last day; run-out windows (often 90 days) to file claims. 2026 health FSA limit $3,400. HSAs have no deadline (2026 limits $4,400 self-only / $8,750 family + $1,000 at 55+, Rev. Proc. 2025-19). Lab tests are a qualified medical expense (IRS Pub 502) regardless of who ordered them; the expense is incurred on the BLOOD-DRAW date, not the order or results date — a Dec 30 draw with January results counts for 2026. TestWell: FSA/HSA card at checkout or itemized receipt (provider, date of service, each test, $6 fee, amount, card last four); physician authorization usually within minutes; walk-ins at most Quest/Labcorp sites; reduced holiday hours → be drawn by Dec 30. Spend by balance: under $50 one test (A1c $18.99, vitamin D $36.99, TSH $20.99, ferritin $21.99); $50–$200 the baseline (General Wellness Panel $49.99: CMP, CBC w/ diff, lipid panel, TSH; Essential Health Panel $189.99 adds A1c, vitamin D, iron, inflammation, insulin); $200+ Heart Health Panel $99.99 (lipids, ApoB, Lp(a), hs-CRP, A1c), hormone panels, General Wellness Advanced $209.99 (14 tests); January requirements — TB blood test $91.99, immunity titers.

Deductibles reset on the first day of the plan year: January 1 for marketplace plans, Medicare Part B and most employer plans; fiscal-year employer plans (often July 1 or October 1) on that date; the out-of-pocket accumulator and any pharmacy deductible reset together; 2026 HSA-eligible HDHP minimum deductible $1,700 self / $3,400 family, out-of-pocket limit $8,500 / $17,000 (Rev. Proc. 2025-19). Medicare Part B's deductible does not apply to covered clinical diagnostic lab tests (paid in full). Deductible MET: clinician-ordered labs are covered at coinsurance (commonly 10–30%) or in full after the out-of-pocket max — get monitoring/follow-up labs performed before the reset (date of service = blood draw; a December order drawn in January bills under the new deductible). Deductible NOT met: you pay the insurer's negotiated rate, usually between the lab's consumer price and a hospital outpatient list price — CMP $21.49 TestWell vs $59 Quest Health vs ≈$200 hospital; CBC $17.99 / $25 / ≈$100; lipid $24.99 / $59 / ≈$150; A1c $18.99 / $45 / ≈$100; TSH $20.99 / $35 / ≈$100; vitamin D $36.99 / $75 / ≈$150; General Wellness Panel $49.99. Cash-pay orders do not count toward the deductible (irrelevant if it won't be met); receipts are HSA/FSA-eligible. Exception: USPSTF A/B preventive screening ordered as screening is covered with no cost-sharing before the deductible (cholesterol screening adults 40–75 and younger at higher risk; diabetes screening with overweight/obesity); the same test ordered to monitor a condition is diagnostic. Open enrollment: on an HDHP, direct cash-pay is the default for routine non-preventive labs and the HSA pays for it tax-free.

December blood work list (TestWell prices; one $6 fee per order): baseline for everyone — CMP $21.49 (fasting, 1–3 business days), CBC with differential $17.99, lipid panel $19.99 (fasting), TSH $20.99 — bundled as the General Wellness Panel $49.99. Add by history: hemoglobin A1c $18.99 (2–4 days, no fasting), vitamin D $36.99, ferritin $21.99, vitamin B12 $19.99 (2–4). Heart disease in the family: Heart Health Panel $99.99 (lipids + ApoB + Lp(a) + hs-CRP + A1c, 3–5 days) or Lp(a) alone $32.99. Instead of a list: Essential Health Panel $189.99 (10 tests, 2–4 days). Due in January: TB blood test $91.99 (3–5 days), immunity titers from $27.99. Women's Health Panel $129.99 (core four + TSH/free T4, ferritin, iron, vitamin D, A1c); Men's Health Panel $139.99 (core four + free/total testosterone, PSA, vitamin D, A1c). Order-by calendar: order by Dec 26, draw fasting in the morning by Dec 30 (sites closed Christmas and New Year's Day, shortened hours between; NY/NJ draw at BioReference); results 1–3 / 2–4 / 3–5 business days; FSA expense date = draw date so January results are fine. Which deadline: FSA balance (every test eligible, itemized receipt), met deductible (clinician orders monitoring tests, buy the rest directly), unmet deductible (skip insurance for routine labs), January physical (bring the report with reviewed ranges). Skip: curiosity hormone/food-sensitivity/heavy-metal panels and repeating a normal six-month-old test.

Polyendocrine metabolic ovarian syndrome (PMOS) is the new name for polycystic ovary syndrome (PCOS), adopted 12 May 2026 by a 56-organisation global consensus (Endocrine Society; The Lancet) with a three-year transition to the 2028 guideline update; the name changed because the follicles are not pathological cysts and the condition is endocrine and metabolic. Diagnostic criteria are unchanged (2023 International Guideline: two of irregular ovulation, androgen excess, polycystic morphology or raised AMH in adults, other causes excluded). Blood tests: total and free testosterone (LC-MS/MS), SHBG, DHEA-S, LH, FSH, prolactin, TSH, 17-OH-progesterone, fasting insulin, glucose, A1c, lipids, AMH. TestWell PCOS / PMOS Panel $240.99 covers the hormone and metabolic set in one draw.

Cortisol peaks 7–9 AM and troughs near midnight, so the test depends on the question: suspected LOW cortisol → morning serum cortisol (7–9 AM; <3 mcg/dL suggests adrenal insufficiency, >15–18 largely excludes it; indeterminate → ACTH stimulation test); suspected HIGH cortisol (Cushing) → late-night salivary cortisol ×2, 24-hour urine free cortisol ×2, or 1 mg overnight dexamethasone suppression — not a daytime blood value. No fasting; oral estrogen raises total cortisol, steroid medications (tablets, inhalers, injections, creams) distort or suppress it, high-dose biotin interferes. 'Adrenal fatigue' is not a recognised diagnosis. TestWell: Cortisol (AM) $26.49, Cortisol PM $34.99; labs' consumer sites list the AM test at $79–$89.

Sourced analysis of the Function Health membership: $365/year for two Quest draws (about 115 markers, then about 60 repeated mid-year; ~100 measured directly per annual draw), first results in about 48 hours, a clinician-reviewed plan that independent reviewers report takes three to four weeks, 48 states (not HI, RI, PR), NY/NJ state fees charged at the draw, HSA/FSA-eligible. Who it suits (annual 100+ marker baseline with interpretation) and who it does not (a specific handful of tests; Labcorp; a retest in three months). Shows what the same Quest tests cost once à la carte, states plainly that the membership is cheaper per marker for the whole list, and links the Function-vs-Superpower comparison and the panel builder. Editorial disclosure at the top; figures dated.

Sourced analysis of the Superpower membership: $199/year ($399 in NY/NJ), one Quest draw of 100+ biomarkers — 57 measured directly, 46 calculated — results in about ten days in the app with an AI protocol (Kin) and a 24/7 care team, wearable and past-lab integration, at-home draw +$119, 41 states + DC, HSA/FSA-eligible. Who it suits (a yearly baseline for the least money per marker, app-centric users) and who it does not (specific tests, Labcorp, specialty markers, a lab PDF on day two). Shows what the same tests cost once à la carte, states plainly that the membership is cheaper per marker for the whole measured list, and links the Function-vs-Superpower comparison and the panel builder. Editorial disclosure at the top; figures dated.

Dirt Cheap Labs (dirtcheaplabs.com), a self-pay lab marketplace drawing at Quest and Labcorp, closed in 2026: per its closing notice it stopped receiving results from the labs on August 14, 2026. Results for draws finished on or after that date are in the lab's own portal (MyQuest for Quest, Labcorp Patient for Labcorp; register with the exact name and date of birth on the order form); earlier results and unused order forms remain downloadable from the Dirt Cheap Labs account, which also offers a delete-everything option. The notice recommends Goodlabs, Anabolic Insights and Mito Health. The page compares the eight most-ordered self-pay tests at TestWell (Quest and Labcorp prices, one $6 fee per order, choice of lab at checkout, BioReference in NY/NJ, results explained with reference ranges and trends) against Goodlabs' sticker prices plus its $12 per-visit lab fee, and states that Goodlabs is cheaper on a single test. Editorial disclosure at the top; closure facts quoted from the notice as read 2026-10-27.

QuantiFERON-TB Gold Plus (QFT-Plus) is the interferon-gamma release assay (IGRA) blood test for TB infection: one tube of blood is exposed to TB-specific peptides (ESAT-6, CFP-10) in Nil, TB1, TB2 and Mitogen tubes and the interferon-gamma released is measured. Positive = TB1−Nil or TB2−Nil ≥ 0.35 IU/mL and ≥ 25% of Nil (TB infection likely; clinical evaluation and chest X-ray follow; it does not distinguish infection from disease). Negative = TB infection unlikely, with an 8–10-week window after exposure and no bearing on symptomatic disease. Indeterminate = high Nil (> 8.0) or failed Mitogen (< 0.5), repeated. Not affected by BCG; CDC-preferred for BCG-vaccinated people and those unlikely to return for a skin-test reading; required (age 2+) for US immigration exams. One visit, no fasting, results 3–5 business days; live vaccines in the prior 4–6 weeks can suppress the response. Priced from the catalog on the page (one $6 fee; Quest/Labcorp, BioReference NY/NJ) against $149 on the labs' own sites.

Most Quest Diagnostics patient service centers open 6:30–8:00 am and close 3:30–5:00 pm on weekdays; most Labcorp centers open 7:00–8:00 am and close 4:00–5:30 pm; hours are set per location and neither lab publishes a national schedule. Many Quest and some Labcorp sites open Saturday mornings; Sunday draws are rare. Appointments get priority at both labs; walk-ins wait for openings. 2026 closures: New Year's Day, Memorial Day (May 25), Independence Day observed (Jul 3), Labor Day (Sep 7), Thanksgiving (Nov 26; Nov 27 limited operations, many sites reduced hours), Christmas Day (Dec 25); Christmas Eve and New Year's Eve typically shortened. Results run a day or two slower in holiday weeks; avoid drawing short-stability tests the day before a holiday; best Thanksgiving-week draw days are Mon Nov 23 and Tue Nov 24 at opening. TestWell's lab finder shows each site's own hours; a TestWell requisition is valid at any center in the chosen network.