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  2. Thyroid's secretory capacity - Wikipedia

    en.wikipedia.org/wiki/Thyroid's_secretory_capacity

    Thyroid's secretory capacity (G T, also referred to as thyroid's incretory capacity, maximum thyroid hormone output, T4 output or, if calculated from serum levels of thyrotropin and thyroxine, as SPINA-GT [a]) is the maximum stimulated amount of thyroxine that the thyroid can produce in a given time-unit (e.g. one second). [2] [3]

  3. Hypothyroidism - Wikipedia

    en.wikipedia.org/wiki/Hypothyroidism

    An elevated TSH level indicates that the thyroid gland is not producing enough thyroid hormone, and free T 4 levels are then often obtained. [ 8 ] [ 17 ] [ 33 ] Measuring T 3 is discouraged by the AACE in the assessment for hypothyroidism. [ 8 ]

  4. Thyroid function tests - Wikipedia

    en.wikipedia.org/wiki/Thyroid_function_tests

    Thyroid hormone uptake (T uptake or T 3 uptake) is a measure of the unbound thyroxine binding globulins in the blood, that is, the TBG that is unsaturated with thyroid hormone. [2] Unsaturated TBG increases with decreased levels of thyroid hormones. It is not directly related to triiodothyronine, despite the name T 3 uptake. [2] Reference ranges:

  5. Thyroid-stimulating hormone - Wikipedia

    en.wikipedia.org/wiki/Thyroid-stimulating_hormone

    Any inappropriateness of measured values, for instance a low-normal TSH together with a low-normal T 4 may signal tertiary (central) disease and a TSH to TRH pathology. Elevated reverse T 3 (RT 3 ) together with low-normal TSH and low-normal T 3 , T 4 values, which is regarded as indicative for euthyroid sick syndrome, may also have to be ...

  6. Thyroid disease - Wikipedia

    en.wikipedia.org/wiki/Thyroid_disease

    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 ...

  7. Jostel's TSH index - Wikipedia

    en.wikipedia.org/wiki/Jostel's_TSH_index

    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.

  8. Thyroid hormone binding ratio - Wikipedia

    en.wikipedia.org/wiki/Thyroid_hormone_binding_ratio

    Thyroid hormone binding ratio (THBR) is a thyroid function test that measures the "uptake" of T3 or T4 tracer by thyroid-binding globulin (TBG) in a given serum sample. This provides an indirect and reciprocal estimate of the available binding sites on TBG within the sample. The results are then reported as a ratio to normal serum.

  9. De Quervain's thyroiditis - Wikipedia

    en.wikipedia.org/wiki/De_Quervain's_thyroiditis

    Thyroid function testing frequently reveals decreased thyroid stimulating hormone (TSH) and increased serum levels of triiodothyronine (T3) and thyroxine (T4) during the acute phase of the disease. [2] The intrathyroidal T3 and T4 levels are often reflected by the T3 to T4 ratio, which is typically less than 20 (ng/dL divided by μg/dL). [22]

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