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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. [1] [2] The equation has been derived from the logarithmic standard model of thyroid homeostasis.
Jostel's TSH index (JTI or TSHI) helps to determine thyrotropic function of anterior pituitary on a quantitative level. [27] It is reduced in thyrotropic insufficiency [27] and in certain cases of non-thyroidal illness syndrome. [26] It is calculated with = +.
Jostel's TSH index; S. Sum activity of peripheral deiodinases; T. Thyroid Feedback Quantile-based Index; Thyroid's secretory capacity;
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. It was originally developed to deliver a method for fast screening for resistance to thyroid hormone .
The Thyroid Feedback Quantile-based Index (TFQI) is a calculated parameter for thyrotropic pituitary function. It was defined to be more robust to distorted data than established markers including Jostel's TSH index (JTI) and the thyrotroph thyroid hormone sensitivity index (TTSI).
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English: Percentiles for thyroid's secretory capacity (SPINA-GT) along with reference ranges for Jostel's TSH index (TSHI or JTI) and univariable reference ranges for thyrotropin (TSH) and free thyroxine (FT4), shown in the two-dimensional phase plane defined by serum concentrations of TSH and FT4.
What Jostel et al. report is the standardized, i.e. z-transformed form of the TSH index. You can easily check the data with SPINA Thyr , a free open source application, which, among others, calculates the TSHI, and you will see that the data are absolutely correct.--