Thyroid peroxidase antibody

A blood sample is needed.

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

This test is done to confirm the cause of thyroid problems, including Hashimoto thyroiditis . The test is also used to find out if an immune or autoimmune disorder is damaging the thyroid.

A negative test means the result is normal. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different specimens. Talk to your health care provider about the meaning of your specific test results.

A positive test may be due to: Granulomatous or subacute thyroiditis (an immune reaction of the thyroid gland that often follows an upper respiratory infection) Hashimoto thyroiditis (a reaction of the immune system against the thyroid gland) High levels of these antibodies have also been linked with an increased risk…

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others. Other risks associated with having blood drawn are slight, but may…

Brent GA, Weetman AP. Hypothyroidism and thyroiditis. In: Melmed S, Auchus RJ, Goldfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology . 14th ed. Philadelphia, PA: Elsevier; 2020:chap 13. Guber HA, Oprea M, Russell YX. Evaluation of endocrine function. In: McPherson RA, Pincus MR, eds. Henry's…