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What Is a Healthy TSH Test Result?

TSH, or thyroid-stimulating hormone, is responsible for making two hormones (T3 and T4) that regulate the body's metabolism. Testing the levels of TSH in the body can help diagnose thyroid gland problems.

  1. Healthy TSH Results for Adults

    • According to WebMD, normal lab results for adults are between 0.4 and 4.5 mIU/L, or between 0.4 and 4.5 mU/L (SI units).

    Healthy TSH Results for Babies

    • Healthy TSH results for babies are different than adults. They should range from 3 to 18 mIU/L or 3 to 18 mU/L (SI units).

    Measuring Other Thyroid Levels

    • Many doctors also recommend testing the amounts of T3, T4 and TSH in the body to get a more accurate picture of the body's thyroid levels.

    Other Tests to Request

    • Hashimoto's disease, an autoimmune disorder of the thyroid, can produce antibodies against that organ but not affect TSH levels in the body. A separate test for autoimmune antibodies can be performed to rule out Hashimoto's.

    How TSH Is Tested

    • TSH levels can be tested by a simple blood draw at a local lab.

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