Thyroid-Stimulating Hormone (TSH)

A thyroid-stimulating Reference hormone Opens New Window (TSH) blood test is used to check for Reference thyroid gland Opens New Window problems. TSH is produced when the Reference hypothalamus Opens New Window releases a substance called thyrotropin-releasing hormone (TRH). TRH then triggers the Reference pituitary gland Opens New Window to release TSH. See pictures of the Reference thyroid gland Opens New Window Reference Opens New Window and the Reference pituitary gland Opens New Window Reference Opens New Window.

TSH causes the thyroid gland to make two hormones: triiodothyronine (T3) and thyroxine (T4). T3 and T4 help control your body's Reference metabolism Opens New Window.

Triiodothyronine (T3) and thyroxine (T4) are needed for normal growth of the brain, especially during the first 3 years of life. A baby whose thyroid gland does not make enough thyroid hormone (congenital hypothyroidism) may, in severe cases, be mentally retarded. Older children also need thyroid hormones to grow and develop normally.

This test may be done at the same time as tests to measure T3 and T4.

© 1995-2011, Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Reference Terms of Use. Reference How this information was developed to help you make better health decisions.