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Thyroid-stimulating hormone (also known as thyrotropin, thyrotropic hormone, or abbreviated TSH) is a pituitary hormone that stimulates the thyroid gland to produce thyroxine (T 4), and then triiodothyronine (T 3) which stimulates the metabolism of almost every tissue in the body. [1]
His prediction of higher sensitivity for the latter was confirmed by the creation by Daya Kishore Hazra working in Ekins laboratory in 1975 of the ultrasensitive TSH assay which revolutionized the management of thyroid diseases by allowing for diagnosis of both hyperthyroidism and hypothyroidism by measuring TSH, as it could differentiate low ...
In this way, intracellular calcium can induce a graded, non-ultrasensitive activation of calcineurin at low levels, leading to LTD, whereas the ultrasensitive activation of CaMKII results in a threshold intracellular calcium level that generates a positive feedback loop that amplifies the signal and leads to the opposite cellular outcome: LTP.
In primary hyperthyroidism TSH are low and TRH administration induces little or no change in TSH levels • In hypothyroidism due to end organ failure, administration of TRH produces a prompt increase in TSH • In hypothyroidism due to pituitary disease (secondary hypothyroidism) administration of TRH does not produce an increase in TSH
Sensitivity of TSH-producing pituitary cells to thyroid hormones; also a marker for the set point of thyroid homeostasis The Thyrotroph Thyroid Hormone Sensitivity Index (abbreviated TTSI , also referred to as Thyrotroph T4 Resistance Index or TT4RI ) is a calculated structure parameter of thyroid homeostasis .
Another study demonstrated the TSH index to inversely correlate to thyroid's secretory capacity and thyroid volume. [26] It is unclear if this finding reflects shortcomings of the index (i.e. low specificity in the setting of subclinical hypothyroidism) or plastic responses of the pituitary gland to beginning hypothyroidism. [citation needed]
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy.
The pituitary gland secretes thyrotropin (TSH; Thyroid Stimulating Hormone) that stimulates the thyroid to secrete thyroxine (T4) and, to a lesser degree, triiodothyronine (T3). The major portion of T3, however, is produced in peripheral organs, e.g. liver, adipose tissue, glia and skeletal muscle by deiodination from circulating T4.
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