All lab testsThyroid
Thyroid issues often present as fatigue, weight changes, hair thinning, and brain fog. A complete thyroid workup goes well beyond TSH alone — order single markers or a full thyroid panel and get the answer in 1-3 business days.
19 options in this category · browse every category
19 tests & panels
The primary screening test for thyroid function — detects both overactive and underactive thyroid.
$35 at other labs
$20.99
+ $6 lab processing fee
TSH plus Free T4 together — the standard pair for evaluating thyroid function.
$59 at other labs
$27.99
+ $6 lab processing fee
The complete thyroid picture — all 7 markers
$300 at other labs
$129.99
+ $6 lab processing fee
The full thyroid picture — not just TSH
$195 at other labs
$109.99
+ $6 lab processing fee
The modern thyroid check — free hormones, measured directly
$115 at other labs
$49.99
+ $6 lab processing fee
Thyroid function and the antibodies that diagnose Hashimoto's, in one draw
$149 at other labs
$97.99
+ $6 lab processing fee
Measures the active thyroid hormone — important for detecting T4-to-T3 conversion issues.
$40 at other labs
$25.99
+ $6 lab processing fee
Measures free (unbound) T4 — the primary hormone produced by the thyroid gland.
$40 at other labs
$20.99
+ $6 lab processing fee
Measures inactive T3 — helps identify thyroid hormone conversion issues and chronic stress effects.
$70 at other labs
$35.99
+ $6 lab processing fee
Evaluates thyroid hormone binding capacity — helps interpret total T3 and T4 results more accurately.
$35 at other labs
$22.99
+ $6 lab processing fee
Measures total triiodothyronine (T3), bound and free — the thyroid hormone that rises first in many cases of an overactive thyroid.
$24.99
+ $6 lab processing fee
Detects antibodies that attack thyroglobulin, a protein essential for thyroid hormone production.
$42 at other labs
$26.49
+ $6 lab processing fee
Thyroglobulin level with thyroglobulin antibodies from one draw — the pair used to monitor after thyroid cancer treatment and to evaluate thyroiditis.
$39.99
+ $6 lab processing fee
Detects autoimmune thyroid conditions like Hashimoto's and Graves' disease.
$75 at other labs
$38.99
+ $6 lab processing fee
The classic 4-marker thyroid panel — TSH, Total T4, T3 Uptake, and calculated Free T4 Index (FTI) from one draw.
$65 at other labs
$36.99
+ $6 lab processing fee
The most common test for Hashimoto's thyroiditis — measures antibodies that attack thyroid enzymes.
$50 at other labs
$25.49
+ $6 lab processing fee
Measures antibodies that bind the TSH receptor — the marker used to confirm Graves' disease and separate it from other causes of an overactive thyroid.
$69.99
+ $6 lab processing fee
The thyroid screen doctors order most: TSH first, and the lab adds free T4 automatically only if TSH comes back abnormal — so one draw gives a diagnosis-ready result when something is off, and costs the same as a plain TSH when nothing is.
$29.99
+ $6 lab processing fee
Detects the antibodies that switch the thyroid on in Graves' disease — the most specific blood test for Graves' hyperthyroidism.
$114.99
+ $6 lab processing fee
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A thyroid test almost always starts with TSH, the pituitary signal that rises when the thyroid is underactive and falls when it is overactive. TSH alone is enough to screen; free T4 turns an abnormal TSH into a diagnosis; free T3, reverse T3 and thyroid antibodies answer more specific questions about symptoms, conversion and autoimmune disease. The table below matches the common reasons people look for a thyroid test to the test that answers them.
All thyroid tests are a standard blood draw at Quest or Labcorp with results in 1–3 business days. No fasting is needed. Two preparation points matter: stop high-dose biotin supplements for at least two days (they distort TSH and T4 assays), and if you take levothyroxine, take it after the draw on test day.
| If you want to… | Order | Why |
|---|---|---|
| Screening for a thyroid problem, or fatigue, weight change, feeling cold or hot | TSH (Thyroid Stimulating Hormone)$20.99 · single test | The most sensitive single test; a normal TSH makes thyroid disease unlikely |
| Abnormal TSH, or symptoms with a borderline TSH | TSH + Free T4$27.99 · single test | Free T4 places the result: overt vs subclinical, hypo vs hyper |
| Family history of thyroid disease or another autoimmune condition | Hashimoto's Thyroid Panel$97.99 · 3 tests | TSH, free T4, free T3 and both thyroid antibodies — finds Hashimoto's before TSH rises |
| Persistent hypothyroid symptoms despite a normal TSH | Comprehensive Thyroid Test (TSH, Free T4, Free T3, Reverse T3, TPO)$109.99 · 4 tests | Adds free T3 and antibodies to see the whole axis |
| Optimizing or troubleshooting thyroid treatment | Advanced Thyroid Panel$129.99 · 7 tests | TSH, free T4, free T3, reverse T3 and antibodies together |
| Checking conversion of T4 to active T3 | Free T3 (Triiodothyronine)$25.99 · single test | The active hormone; read with TSH and free T4 |
| Suspected Hashimoto's or Graves' disease | Thyroid Antibodies$38.99 · single test | TPO and thyroglobulin antibodies identify autoimmune thyroid disease |
| Monitoring a levothyroxine dose | TSH (Thyroid Stimulating Hormone)$20.99 · single test | Rechecked 6–8 weeks after any dose change, then every 6–12 months |
Symptoms are the usual reason: an underactive thyroid causes fatigue, feeling cold, weight gain without a change in habits, constipation, dry skin, hair thinning, heavy periods and low mood; an overactive one causes weight loss, heat intolerance, palpitations, tremor, anxiety, insomnia and lighter periods. Risk factors prompt testing without symptoms: a goiter or nodule, a family history of thyroid disease, another autoimmune condition such as type 1 diabetes or celiac disease, previous neck radiation, and medications including amiodarone, lithium and cancer immunotherapy. Women planning pregnancy or pregnant are commonly tested because thyroid function affects fertility and pregnancy and has its own reference ranges.
Anyone on levothyroxine needs TSH to guide the dose — 6–8 weeks after a dose change, then every 6–12 months once stable, per the American Thyroid Association.
TSH alone is the right first test for most people: it is inexpensive and, in someone with a normal pituitary, a normal value rules out thyroid disease with high confidence. A panel makes sense when the TSH is likely to be abnormal or has been before, when symptoms persist despite a normal TSH, when autoimmune disease is suspected, or when you want to avoid a second visit. Free T4 is what turns an abnormal TSH into a pattern (overt vs subclinical, thyroid vs pituitary); TPO antibodies show whether Hashimoto's is behind a high TSH and predict who progresses; free T3 and reverse T3 are for specific questions about conversion and are rarely decisive on their own.
High TSH with low free T4 is overt hypothyroidism; high TSH with normal free T4 is subclinical and is usually repeated in 6–12 weeks because many mild elevations normalize. Low TSH with high free T4 or T3 is hyperthyroidism; low TSH with normal hormones is subclinical hyperthyroidism. TSH and free T4 both low points to the pituitary. The upper limit of normal TSH drifts higher after 70, and pregnancy lowers the range in the first trimester. The TSH, free T4, free T3 and TPO antibody biomarker pages carry the reviewed reference bands and what each high or low pattern suggests.
TSH. It is the most sensitive single screen and the test every guideline starts with. Add free T4 when TSH is abnormal or symptoms are strong, and TPO antibodies when autoimmune thyroid disease is a possibility.
Yes. Order online, a licensed physician reviews the requisition, and you have blood drawn at a nearby Quest or Labcorp. Results arrive in your portal in 1–3 business days.
No. Stop high-dose biotin for at least two days before the draw, and if you take levothyroxine, take it after the draw and note the timing.
About 0.45–4.5 mIU/L for most adults, with slight variation between labs; the upper limit drifts higher in people over 70 and pregnancy lowers the range in the first trimester.
On levothyroxine: 6–8 weeks after a dose change and every 6–12 months once stable. Without known thyroid disease there is no fixed interval; recheck when symptoms change or a first result was borderline.
The Hashimoto's Thyroid Panel (TSH, free T4, free T3, TPO and thyroglobulin antibodies) confirms the diagnosis and tracks it; the Advanced panel adds reverse T3 for fuller monitoring on treatment.
Educational only — not a diagnosis. Discuss any result outside the reference range with a clinician.