What do the results mean?High TSH levels can mean your thyroid is not making enough thyroid hormones, a condition called hypothyroidism. Low TSH levels can mean your thyroid is making too much of the hormones, a condition called hyperthyroidism. A TSH test does not explain why TSH levels are too high or too low. If your test results are abnormal, your health care provider will probably order additional tests to determine the cause of your thyroid problem. These tests may include:T4 thyroid hormone testsT3 thyroid hormone testsTests to diagnose Graves' disease, an autoimmune disease that causes hyperthyroidismTests to diagnose Hashimoto's thyroiditis, an autoimmune disease that causes hypothyroidismLearn more about laboratory tests, reference ranges, and understanding results.
