If a TSH test result is unexpected, simply repeating the test is often the best course of action. Errors can occur during the blood draw, in transcribing the results, or due to mix-ups in the lab.

The thyroid-stimulating hormone (TSH) test measures the amount ... 0 to 0.4 mU/L 0.4 to 4 mU/L 4–10 mU/L 10 mU/L Many labs use these reference values. However, there is some debate about these ...