--- title: T3 Uptake Test type: test id: t3-uptake url: "https://www.test-well.com/tests/t3-uptake-test" price_usd: 22.99 lab_fee_usd: 6 all_in_usd: 28.99 cpt: 84479 category: Thyroid sample: Blood draw fasting_required: false results_in: "1–3 business days" labs: - Quest - Labcorp - BioReference orderable: true reviewed_at: 2026-09-14 order_url: "https://www.test-well.com/cart?add=t3-uptake-test&utm_source=ai_agent&utm_medium=markdown" --- # T3 Uptake Test > Evaluates thyroid hormone binding capacity — helps interpret total T3 and T4 results more accurately, measured from a standard blood draw. At TestWell it costs $22.99 plus a $6 lab fee, needs no fasting, and results post in 1–3 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp. ## Key facts | Fact | Value | | --- | --- | | Price | $22.99 + $6 lab processing fee per order ($28.99 all-in for this test alone) | | CPT code | 84479 | | Sample | Blood draw | | Fasting | Not required | | Results | 1–3 business days | | Labs | Quest Diagnostics, Labcorp, BioReference (NY & NJ) | | Biomarkers measured | 1 | | Physician authorization | Included — no doctor's visit, referral or insurance needed | | Payment | Card, HSA or FSA; cash-pay only (no insurance billing) | ## What does the T3 Uptake test tell you? Evaluates thyroid hormone binding capacity — helps interpret total T3 and T4 results more accurately. T3 Uptake (also called T3 Resin Uptake or THBR) is an indirect measure of how much thyroid-binding protein in your blood is available to carry thyroid hormones. It does not measure T3 hormone levels directly. Instead, it helps determine whether abnormal total T3 or T4 levels are due to actual thyroid dysfunction or simply changes in binding protein levels (which can be affected by pregnancy, estrogen therapy, liver disease, or certain medications). When combined with Total T4, the T3 Uptake allows calculation of the Free Thyroxine Index (FTI), providing a more accurate assessment of thyroid status. **Clinical use:** Thyroid testing measures the hormones that regulate metabolism, energy, body temperature, weight, and mood — identifying both overactive and underactive thyroid conditions. ## Who should order it? Anyone with fatigue, weight changes, mood changes, hair loss, cold/heat intolerance, irregular cycles, or family history of thyroid disease. ## Biomarkers measured - T3 Uptake ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $22.99 | $28.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $22.99 | $28.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | BioReference (NY & NJ) | $16.99 | $22.99 | New York and New Jersey orders route here automatically | Rhode Island is not served. Prices are identical online and in the lab; no draw fee or physician fee is added. ## How much does a T3 Uptake test cost? A T3 Uptake test costs $22.99 at TestWell — $28.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $120.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible. | Where you order | Price | One test, all-in | Notes | | --- | --- | --- | --- | | TestWell (drawn at Quest or Labcorp) | $22.99 | $28.99 | Includes the one $6 lab processing fee, charged once per order | | Hospital outpatient lab, self-pay (typical) | $120.00 | $120.00 | Reference figure; hospital charges vary widely by facility and are often higher | Lab test codes: Quest test code 861 · Labcorp test no. 001156 · BioReference code 0152-9. ## How do you prepare? No fasting or special preparation required. ## Related conditions - [Hypothyroidism](https://www.test-well.com/conditions/thyroid-problems) (E03.9) - [Hyperthyroidism](https://www.test-well.com/conditions/thyroid-problems) (E05.90) ## Common questions about the T3 Uptake test ### How long do T3 Uptake results take? Most T3 Uptake results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment results are ready, with everything viewable in your TestWell portal. ### What sample is collected for the T3 Uptake? Blood draw. Sample is collected at a Quest, Labcorp, or BioReference patient service center near you, or via at-home phlebotomy where available. ### How much does the T3 Uptake cost without insurance? On TestWell, the T3 Uptake is $22.99. Quest Direct lists comparable tests at $35. Walk-in hospital labs typically bill $120 or more without insurance. Insurance is not required — pay one all-in price. ### Do I need to fast before the T3 Uptake? No fasting required for the T3 Uptake. No fasting or special preparation required. ### Where can I get the T3 Uptake done? The T3 Uptake is available at Quest and Labcorp patient service centers nationwide. Order online at TestWell, pick your preferred lab, and we'll generate a digital requisition for the location closest to you. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=t3-uptake-test&utm_source=ai_agent&utm_medium=markdown 2. Create an account or sign in, confirm your state and preferred lab, pay by card, HSA or FSA. 3. A licensed physician authorizes the order (usually within minutes); the requisition arrives by email. 4. Walk into any Quest Diagnostics, Labcorp, BioReference (NY & NJ) patient service center — no appointment needed at most sites. 5. Results post to your TestWell portal in 1–3 business days with reference ranges and flags. ## Related - [Advanced Thyroid Panel](https://www.test-well.com/tests/advanced-thyroid-panel) — 7 tests · $129.99 - [Free T3 (Triiodothyronine)](https://www.test-well.com/tests/free-t3) — $30.99 - [Free T4 (Thyroxine)](https://www.test-well.com/tests/free-t4-test) — $23.99 - [Reverse T3](https://www.test-well.com/tests/reverse-t3) — $35.99 - [T3, Total (Triiodothyronine)](https://www.test-well.com/tests/total-t3-test) — $24.99 - [Thyroglobulin Antibodies](https://www.test-well.com/tests/thyroglobulin-antibodies) — $26.99 - [All Thyroid tests](https://www.test-well.com/tests/category/thyroid) - [Full test directory](https://www.test-well.com/tests/directory) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-14. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/tests/t3-uptake-test Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.