Free lab testing tools
Utilities for making sense of blood work — built on the same reference catalog and pricing data that power TestWell's test pages. No account needed; each tool links to the biomarker guide and the test that produces the number.
Reference Range Lookup
Normal ranges for 130+ blood tests, filtered by sex and age, with units and sources.
Open toolLab Unit Converter
Switch any common blood test between US and SI units, with the exact factor shown.
Open toolFree Testosterone Calculator
Free and bioavailable T from total T + SHBG + albumin, using the Vermeulen equation.
Open toolLab Results Explainer
Paste your results; each value is flagged against reviewed reference ranges with what high or low can mean.
Open toolLab Test Price Checker
Quest, Labcorp and TestWell prices for any blood test, with source links and check dates.
Open toolAnalyze My Lab Results with AI
A copy-paste prompt that makes ChatGPT or Claude read your results against reviewed ranges.
Open toolNLR Calculator
Neutrophils ÷ lymphocytes from your CBC, with the published healthy range.
Open toolFIB-4 Calculator
The guideline liver-fibrosis score from age, AST, ALT and platelets, with the 1.3 / 2.67 cut points.
Open toolHOMA-IR Calculator
Glucose × insulin ÷ 405 — the standard insulin-resistance estimate, with unit toggles.
Open toolTyG Index Calculator
ln(TG × glucose ÷ 2) — insulin resistance from numbers already on your lipid panel.
Open toolA1c to eAG Calculator
Turn an A1c into the average glucose it represents, with the ADA categories.
Open toolAnion Gap Calculator
Na − (Cl + HCO₃) from your metabolic panel, with the albumin correction.
Open toolBiological Age Calculator
Levine's PhenoAge from a CMP, a CBC with differential and hs-CRP — with each marker's contribution.
Open toolLH:FSH Ratio Calculator
LH ÷ FSH from a day 2–4 draw, with what the common patterns mean.
Open toolCorrected Calcium Calculator
Albumin-adjusted calcium from a metabolic panel, with the usual, low and high bands.
Open toolLDL Cholesterol Calculator
LDL from a standard lipid panel, two equations, with non-HDL and the TC:HDL ratio.
Open toolTriglyceride to HDL Ratio Calculator
Fasting triglycerides ÷ HDL, with the cut points studies use for insulin resistance.
Open toolSerum Osmolality Calculator
2 × Na + glucose/18 + BUN/2.8, term by term, with the osmolal gap explained.
Open toolBUN to Creatinine Ratio Calculator
BUN ÷ creatinine, with the patterns a low, usual or high ratio suggests.
Open toolTransferrin Saturation Calculator
Iron ÷ TIBC as a percentage, with UIBC and the deficiency and overload thresholds.
Open toolLab Location Finder
Search 4,000+ Quest, Labcorp and BioReference draw sites by ZIP, with hours and directions.
Open toolHow do these tools relate to ordering a test?
Each tool is a front door to the catalog rather than a standalone widget: look up a range and you can open the marker's full guide; convert a value and you land on its reference range; calculate free testosterone and the test that measures total T and SHBG is one click away. Prices shown are live from the catalog, orders are physician-authorized, and draws happen at Quest, Labcorp or BioReference locations in 49 states.