Thyroid Stimulating Hormon (TSH)

Thyroid Stimulating Hormone (TSH) is a hormone produced by the pituitary gland in the brain that regulates the production of thyroid hormones in the thyroid gland. TSH is commonly measured through a blood test to assess thyroid function and diagnose thyroid disorders such as hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid). The normal range of TSH levels may vary depending on the laboratory but generally falls between 0.4 to 4.0 milli-international units per liter (mIU/L). High TSH levels may indicate an underactive thyroid, while low TSH levels may indicate an overactive thyroid.