Current promotion
Thyroid Blood Test Panels: TSH, Free T4, Free T3 & Antibodies
From a basic TSH check to a full antibody workup, a complete menu of thyroid tests and panels, currently 20% off.
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Individual thyroid tests from $17.56 and multi-test panels from $39.12 to $340.76 with code TH20 (promotional pricing at time of writing).
At a glance
Thyroid blood test panels measure the hormones and antibodies that regulate metabolism, energy, and mood, including TSH, Free T4, Free T3, reverse T3, and thyroid antibodies such as TPO, TgAb, and TSI. This promotion bundles the partner's ten most-ordered thyroid tests and panels at 20% off with code TH20, with blood draws at more than 2,100 Quest locations nationwide. It suits anyone establishing a thyroid baseline, investigating symptoms like persistent fatigue or unexplained weight change, or tracking existing thyroid results with their doctor.
Best suited for
- Adults with persistent fatigue, unexplained weight changes, mood shifts, hair thinning, or temperature sensitivity who want objective data to discuss with a clinician
- Anyone establishing a thyroid baseline as part of an annual health review
- People with a family history of thyroid conditions who want to track markers associated with autoimmune thyroid disease
- Those already on thyroid medication whose doctor recommends periodic monitoring between visits
- Budget-conscious testers who prefer to order a standalone TSH or Free T4 test rather than a full panel
What's included
Top 10 Thyroid Lab Tests panel (9 tests, 11 biomarkers)
Thyroid Foundation Panel (13 tests, 23 biomarkers)
Thyroid Foundation Panel Plus Thyroid Panel Add-On (15 tests, 78 biomarkers)
TH-1 Thyroid Health panel (TSH + Free T4)
TH-2 Thyroid Health panel (5 tests, 6 biomarkers)
TH-3 Thyroid Health panel (7 tests, 9 biomarkers)
TH-4 Thyroid Health panel (9 tests, 11 biomarkers)
TSH (Thyroid-Stimulating Hormone) Test
T4 Free (Free Thyroxine) Test
T3 Free (Free Triiodothyronine) Test
T4 Total Test
T3 Total Test
T3 Reverse (rT3) Test
Thyroid Peroxidase (TPO) and Thyroglobulin Antibodies (TgAb) Test
TSI (Thyroid Stimulating Immunoglobulin) Test
Deep-dive the key markers: TSH, Free T3, Free T4, Ferritin, Vitamin D
Key biomarker ranges
Commonly used adult reference ranges for markers this panel measures, labs vary, so always interpret results against your lab's stated ranges and with your doctor.
Commonly used reference ranges run roughly 0.4–4.0 µIU/mL; TSH moves inversely to thyroid activity, and time of day, illness, and biotin can skew results.
| Zone | Range |
|---|---|
| Low | 0–0.4 µIU/mL |
| Normal range | 0.4–4 µIU/mL |
| Mildly elevated | 4–6 µIU/mL |
| High | 6–10 µIU/mL |
Commonly used reference ranges run roughly 2.3–4.2 pg/mL; Free T3 is best interpreted alongside TSH and Free T4 rather than in isolation.
| Zone | Range |
|---|---|
| Low | 0–2.3 pg/mL |
| Normal range | 2.3–4.2 pg/mL |
| High | 4.2–6 pg/mL |
Commonly used reference ranges run roughly 0.8–1.8 ng/dL; Free T4 shows thyroid hormone supply, while TSH shows the pituitary’s demand signal.
| Zone | Range |
|---|---|
| Low | 0–0.8 ng/dL |
| Normal range | 0.8–1.8 ng/dL |
| High | 1.8–3 ng/dL |
The importance of testing
Your thyroid sets the pace of your metabolism, and small shifts in its hormone output can show up as changes in energy, weight, mood, or temperature tolerance. TSH is the most sensitive single indicator of thyroid function, while Free T4 and Free T3 measure the active, unbound hormones that actually drive metabolism. Total T4 and Total T3 capture overall circulating hormone levels, and reverse T3 reflects how efficiently T4 is being converted into active T3.
Antibody tests add another layer. Thyroid peroxidase (TPO) and thyroglobulin (TgAb) antibodies are markers associated with autoimmune thyroid conditions such as Hashimoto's thyroiditis, while thyroid stimulating immunoglobulin (TSI) is a marker associated with Graves' disease. Measuring them alongside hormone levels helps your doctor see whether an immune process may be influencing the gland, context that a TSH result alone can't provide.
The larger panels in this promotion also fold in supporting tests: a Comprehensive Metabolic Panel for related liver and kidney markers, ferritin and iron studies (iron status influences thyroid hormone production), and vitamin D, which plays a role in immune and endocrine function. The partner's page notes that more than 20 million Americans have thyroid disorders, many of them unrecognized, which is why establishing your own numbers matters.
A single reading is a snapshot; the real value comes from trends. Retesting on a schedule you set with your clinician shows whether markers are stable, drifting, or responding to therapy, and gives you concrete results to review together rather than symptoms alone.
Promo code
TH20Save 20% with code TH20, current promotion; confirm final pricing on the partner page.
Ready to get your numbers? Order online, visit a nearby draw site, and receive private results to review with your doctor.
Order NowFrequently asked questions
Can I order thyroid blood tests without a doctor's visit?
Yes, every order includes a physician's authorization, so no office visit or referral is required. You order online, have your blood drawn at a Quest location (walk-ins welcome or schedule ahead), and receive physician-reviewed results in your secure online account.
What do these thyroid tests actually measure?
They measure thyroid hormone levels (TSH, Free and Total T4, Free and Total T3, reverse T3) and thyroid antibodies (TPO, TgAb, TSI) that are markers associated with autoimmune thyroid conditions such as Hashimoto's thyroiditis and Graves' disease. Larger panels add supporting tests, a Comprehensive Metabolic Panel, ferritin and iron studies, and vitamin D, for a broader view of the systems connected to thyroid function.
Which thyroid panel should I choose?
It depends on how much detail you want: the TH-1 panel covers the two foundational markers (TSH and Free T4), TH-2 and TH-3 add total and free hormone levels plus antibodies, and TH-4 and the Top 10 Thyroid Lab Tests bundle offer the most comprehensive view including autoimmunity markers. If you're unsure, a basic TSH plus Free T4 baseline is a common starting point, and your doctor can help you decide whether deeper testing is worthwhile.
How quickly will I get my results?
Most results are available within 24 to 48 hours of your blood draw. Each result is reviewed by a licensed physician and posted to your confidential online account, where you can download the report to share with your own doctor.
How do I apply the discount, and can I pay with HSA or FSA funds?
Enter promo code TH20 at checkout to save 20% on the featured thyroid tests and panels, and yes, the partner accepts both HSA and FSA payments for eligible testing services. The 20% promotion is described as limited-time, so confirm the final price on the partner page before ordering.
Is this testing available in every state?
No, direct-to-consumer lab testing is restricted or prohibited in New York, New Jersey, and Rhode Island, so residents of those states may be blocked at the partner's checkout. Elsewhere, testing is available at more than 2,100 Quest locations nationwide.
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