Thyroid function tests are used to check whether your thyroid is working normally.
The most common thyroid function tests are:
If you are being screened for thyroid disease, often only the thyroid stimulating hormone (TSH) test may be needed.
Other thyroid tests include:
The vitamin biotin (B7) can affect the results of many thyroid hormone tests. If you take biotin, talk to your provider before you have any thyroid function tests.
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Salvatore D, Cohen R, Kopp PA, Larsen PR. Thyroid pathophysiology and diagnostic evaluation. In: Melmed S, Auchus RJ, Golfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 11.
Weiss RE, Refetoff S. Thyroid function testing. In: Jameson JL, De Groot LJ, de Kretser DM, et al, eds. Endocrinology: Adult and Pediatric. 7th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 78.BACK TO TOP
Review Date: 1/9/2022
Reviewed By: Robert Hurd, MD, Professor of Endocrinology and Health Care Ethics, Xavier University, Cincinnati, OH. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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