As Measured by Thyroid Stimulating Hormone
TSH or thyroid stimulating hormone is a hormone produced by the pituitary gland in the brain.
After being released into the bloodstream by the pituitary gland, TSH then stimulates the thyroid to release the thyroid hormones T3 and T4. T3 and T4 help to regulate the amount of energy that is used in the body.
TSH can be used as a screening marker for an overactive ( hyperthyroidism) or underactive (hypothyroidism) thyroid gland. TSH, along with the regulatory marker TRH produced in the hypothalamus, is the primary feedback system that the body uses to maintain stable amounts of thyroid hormones and subsequent energy regulation.
TSH does not always solely reflect thyroid hormone levels. Further testing such as TRH, T4 and T3 can be conducted to learn more about thyroid gland functionality.