Thyroid Stimulating Hormone (TSH)

Test Details

TSH test measures the level of thyroid-stimulating hormone (TSH) in the blood. TSH, also known as thyrotropin, is produced by the pituitary gland. This hormone plays a crucial role in regulating the thyroid gland. It stimulates the production of thyroid hormones, thyroxine (T4) and triiodothyronine (T3), which play a vital role in regulating metabolism, heart rate and digestion, bone and muscle functioning, and brain development. If the pituitary gland produces too much or too little TSH, it affects how the thyroid gland functions. A TSH test measures the amount of TSH in the blood and checks for thyroid issues. The TSH test results can indicate whether the thyroid is producing too much or too little hormone. It is typically the first test doctors order if anyone is showing symptoms suggestive of thyroid problems like hyperthyroidism (low levels of TSH) or hypothyroidism (high levels of TSH). It may also be prescribed to track the effectiveness of treatment for thyroid disorders. If your TSH test results are abnormal, your doctor will likely order additional thyroid blood tests to detect the issue.