--- title: TPO Antibodies Test type: biomarker url: "https://www.test-well.com/biomarkers/tpo-antibodies" also_known_as: - tpo antibodies - tpo ab - anti-tpo - thyroid peroxidase antibody - thyroid peroxidase antibodies category: Thyroid units: - IU/mL order_price_usd: 51.99 order_item: Thyroid Antibodies order_url: "https://www.test-well.com/tests/thyroid-antibodies" reviewed_at: 2026-09-05 --- # TPO Antibodies > TPO Antibodies is measured with a standard blood draw; no fasting is needed. A typical reference range is 0.000 – 35.0 IU/mL. At TestWell it's $51.99 all-in as Thyroid Antibodies, results in 3–5 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis. Also known as: tpo antibodies, tpo ab, anti-tpo, thyroid peroxidase antibody, thyroid peroxidase antibodies. ## Key facts | Fact | Value | | --- | --- | | Units | IU/mL | | Sample | Blood draw | | Fasting | Not required | | Results | 3–5 business days | | Price | $51.99 | | Labs | Quest or Labcorp | ## What does TPO Antibodies measure? Antibodies against thyroid peroxidase. The most common marker of autoimmune thyroid disease. ## What is the normal range for TPO Antibodies? | Population | Reference range | | --- | --- | | age 18+ | 0.000 – 35.0 IU/mL | Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them. ## What does a high TPO Antibodies mean? Often reflects Hashimoto's (most common) or Graves' disease. Many people have elevated TPO antibodies without overt thyroid dysfunction. ## How do you get tested for TPO Antibodies? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [Thyroid Antibodies](https://www.test-well.com/tests/thyroid-antibodies) | Single test | $51.99 | This marker | | [Hashimoto's Thyroid Panel](https://www.test-well.com/tests/hashimotos-thyroid-panel) | Panel | $97.99 | 3 tests | | [Advanced Thyroid Panel](https://www.test-well.com/tests/advanced-thyroid-panel) | Panel | $129.99 | 7 tests | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | Yes | $51.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | Labcorp | Yes | $51.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. | - [What a high TPO Antibodies means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/tpo-antibodies/high) ## Common questions about TPO Antibodies ### Do I need a doctor's order to test my tpo antibodies? No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor. ### How long does it take to get TPO Antibodies results? Most TPO Antibodies results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal. ### How much does a TPO Antibodies test cost? Our Thyroid Antibodies starts at $51.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted. ### Do I need to fast before my TPO Antibodies test? Fasting is not required for the TPO Antibodies test. You can have your blood drawn any time of day. ### Which lab will process my TPO Antibodies test? Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations. ## Sources - [American Thyroid Association](https://www.thyroid.org/thyroid-function-tests/) - [MedlinePlus (NIH) — Thyroid Antibodies](https://medlineplus.gov/lab-tests/thyroid-antibodies/) ## Related biomarkers - [TSH](https://www.test-well.com/biomarkers/tsh) - [Free T4](https://www.test-well.com/biomarkers/free-t4) - [Free T3](https://www.test-well.com/biomarkers/free-t3) - [Reverse T3](https://www.test-well.com/biomarkers/reverse-t3) - [Thyroglobulin Antibodies](https://www.test-well.com/biomarkers/thyroglobulin-antibodies) - [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup) - [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter) - [All biomarkers](https://www.test-well.com/biomarkers) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-05. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/tpo-antibodies 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.