- Absoludy TSH is a FIA(Fluorescence immunoassay) based quantitative measuring diagnostic test. -Monitoring after treatment of Hypothyroidism &Thyroid cancer -Thyroid disease patients: over 20 million in US (more than diabetes patients) -Clinical Meaning Thyroid-stimulating hormone (also known as thyrotropin, thyrotrophic hormone, TSH, or hTSH for human TSH) is a pituitary hormone that stimulates the thyroid gland to produce thyroxine (T4), and then triiodothyronine (T3) which stimulates the metabolism of almost every tissue in the body. It is a glycoprotein hormone synthesized and secreted by thyrotrope cells in the anterior pituitary gland, which regulates the endocrine function of the thyroid.