What does thyrotropin mean?
Thyrotropin, commonly abbreviated TSH, is a hormone released by the anterior pituitary gland. Its principal function is to stimulate the thyroid gland, promoting the production and release of the thyroid hormones T4 and T3, which help regulate metabolism and many other bodily functions. Because these hormones exert negative feedback on the pituitary, falling thyroid hormone levels lead to increased thyrotropin secretion. Measuring serum thyrotropin is therefore important in evaluating suspected thyroid disorders: an elevated TSH often accompanies an underactive thyroid, while an unexpectedly low TSH may indicate excessive thyroid activity or certain pituitary conditions. Thyrotropin is distinct from the thyroid hormones it regulates and from thyrotropin-releasing hormone, the hypothalamic signal that causes the pituitary to produce it. Although encountered outside medicine in discussions of hormones and endocrinology, it remains a specialized biomedical term rather than ordinary vocabulary.
nounThyrotropin is a glycoprotein hormone secreted by the anterior pituitary gland that stimulates the thyroid gland to produce and release thyroid hormones. It is also called thyroid-stimulating hormone, or TSH.
- A pituitary glycoprotein hormone that stimulates thyroid hormone synthesis, secretion, and thyroid growth.
"A blood test revealed elevated thyrotropin, suggesting that the thyroid gland was not producing enough hormone."
"The laboratory reported unusually high thyrotropin levels in the patient's blood."
"Thyrotropin secretion by the anterior pituitary increases when circulating thyroid hormone levels fall."
Rare in general usage; the singular form dominates in clinical writing because the hormone is normally discussed as a single substance.
"The researchers found high thyrotropins in several participants."
A tiny pituitary messenger tells the thyroid when to release the hormones that regulate the body's metabolism.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does thyrotropin come from?
Thyrotropin is a modern scientific compound formed from "thyroid" and the combining form "-tropin." "Thyroid" comes through Latin from Greek thyreos, meaning "door" or "shield," and eidos, meaning "form," reflecting the gland's shield-like appearance. The "-tropin" element derives from Greek tropikos, associated with turning or being directed toward, and is used in names of hormones that act upon particular glands or tissues.
How thyrotropin is actually used
This is a technical term used chiefly in endocrinology, clinical medicine, and laboratory science. It is uncommon in general prose, and the spelling "thyrotrophin" is also encountered in British usage.
Easily confused with thyrotropin
Thyrotropin signals the thyroid gland to release hormones, whereas thyroxine is one of the thyroid hormones being regulated.
Thyrotropin is secreted by the pituitary gland, while thyrotropin-releasing hormone is produced by the hypothalamus and prompts the pituitary to release thyrotropin.