Test guide
Thyroid Antibody Tests
A thyroid antibody test measures the level of thyroid antibodies in a sample of your blood to check for an autoimmune thyroid disease . Your thyroid is a small, butterfly-shaped gland in your neck. It makes hormones that control many activities in your body, including your heart rate and how fast you burn calories from food.
What it is for
Your provider may use thyroid antibody tests if other tests have shown that you have hypothyroidism or hyperthyroidism. These tests usually look for T3 , T4 , and TSH (thyroid-stimulating hormone) . If any of these tests come back with results that show your levels are too high or too low, your provider may then use thyroid antibody tests to see if an autoimmune disease is causing the problem. There are different tests that check for various types of thyroid antibodies. These antibodies each target different proteins that help your thyroid make hormones. These antibodies include: Source: MedlinePlus, National Library of Medicine. Medical test information is public domain. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Limitations
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
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