--- title: T3, Total (Triiodothyronine) Test type: test id: total-t3 url: "https://www.test-well.com/tests/total-t3-test" price_usd: 24.99 lab_fee_usd: 6 all_in_usd: 30.99 category: Thyroid sample: Blood draw fasting_required: false results_in: "1–3 business days" labs: - Quest - Labcorp - BioReference orderable: true order_url: "https://www.test-well.com/cart?add=total-t3-test&utm_source=ai_agent&utm_medium=markdown" --- # T3, Total (Triiodothyronine) Test > Measures total triiodothyronine (T3), bound and free — the thyroid hormone that rises first in many cases of an overactive thyroid, measured from a standard blood draw. At TestWell it costs $24.99 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 | $24.99 + $6 lab processing fee per order ($30.99 all-in for this test alone) | | 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, Total (Triiodothyronine) test tell you? Measures total triiodothyronine (T3), bound and free — the thyroid hormone that rises first in many cases of an overactive thyroid. Total T3 measures all of the triiodothyronine in your blood — the roughly 99% carried on binding proteins plus the small free fraction. T3 is the more active thyroid hormone, and in hyperthyroidism it often rises earlier and further than T4, so total T3 is part of the standard work-up when TSH is low: it distinguishes ordinary Graves' disease or toxic nodules from the less common 'T3 toxicosis' in which only T3 is elevated, and it helps gauge severity. It is less useful for diagnosing an underactive thyroid, where T3 tends to stay normal until late. Because total T3 counts protein-bound hormone, anything that changes binding proteins — pregnancy, estrogen, oral contraceptives, liver disease, some medications — shifts the result without changing thyroid function, which is why clinicians read it alongside TSH and free T4 (and sometimes free T3). ## Biomarkers measured - T3, Total ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $24.99 | $30.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $29.99 | $35.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | BioReference (NY & NJ) | $24.99 | $30.99 | 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, Total (Triiodothyronine) test cost? A T3, Total (Triiodothyronine) test costs $24.99 at TestWell — $30.99 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) | $24.99 | $30.99 | 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 859 · Labcorp test no. 002188 · BioReference code 0150-3. ## How do you prepare? No fasting required. Stop high-dose biotin supplements at least 2 days before the draw (biotin interferes with thyroid assays). If you take thyroid medication, take your dose after the blood draw. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=total-t3-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 - [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 Uptake](https://www.test-well.com/tests/t3-uptake-test) — $22.99 - [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) --- Canonical page: https://www.test-well.com/tests/total-t3-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.