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from quantiles of FT4 and TSH concentration (as determined based on cumulative distribution functions). [30] Per definition the TFQI has a mean of 0 and a standard deviation of 0.37 in a reference population. [30] Higher values of TFQI are associated with obesity, metabolic syndrome, impaired renal function, diabetes, and diabetes-related ...
from quantiles of FT4 and TSH concentration (as determined based on cumulative distribution functions). [1] Per definition the TFQI has a mean of 0 and a standard deviation of 0.37 in a reference population. [1] This explains the reference range of –0.74 to + 0.74.
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]
TSH levels are determined by a classic negative feedback system in which high levels of T3 and T4 suppress the production of TSH, and low levels of T3 and T4 increase the production of TSH. TSH levels are thus often used by doctors as a screening test, where the first approach is to determine whether TSH is elevated, suppressed, or normal. [25]
Therefore, when TRH is given exogenously, TSH levels increase. If the increase in serum TSH level following TRH administration is absent or very slight, then the cause of the hypothyroidism is in the anterior pituitary gland, i.e. the pituitary is not secreting TSH. Therefore, even when TRH is given exogenously, TSH levels do not rise as the ...
Jostel's TSH index (TSHI or JTI), also referred to as Jostel's thyrotropin index or Thyroid Function index (TFI), is a method for estimating the thyrotropic (i.e. thyroid stimulating) function of the anterior pituitary lobe in a quantitative way.
The TSH, in turn, stimulates the thyroid to produce thyroid hormone until levels in the blood return to normal. Thyroid hormone exerts negative feedback control over the hypothalamus as well as anterior pituitary, thus controlling the release of both TRH from hypothalamus and TSH from anterior pituitary gland.
Deutsch: Referenzbereiche für die Sekretionsleistung der Schilddrüse (SPINA-GT) und den TSH-Index nach Jostel (TSHI oder JTI) verglichen mit univariablen Referenzbereichen für Thyreotropin (TSH) und freies Thyroxin (FT4), dargestellt im zweidimensionalen Phasenraum, der durch TSH- und FT4-Serumkonzentrationen definiert ist.