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  2. Thyroid function tests - Wikipedia

    en.wikipedia.org/wiki/Thyroid_function_tests

    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.

  3. Triiodothyronine - Wikipedia

    en.wikipedia.org/wiki/Triiodothyronine

    Triiodothyronine can be measured as free triiodothyronine, which is an indicator of triiodothyronine activity in the body. It can also be measured as total triiodothyronine, which also depends on the triiodothyronine that is bound to thyroxine-binding globulin. [18]

  4. Hypothalamic–pituitary–thyroid axis - Wikipedia

    en.wikipedia.org/wiki/Hypothalamic–pituitary...

    Low-T3 syndrome and high-T3 syndrome: Consequences of step-up hypodeiodination, e.g. in critical illness as an example for type 1 allostasis, [20] or hyperdeiodination, as in type 2 allostasis, including posttraumatic stress disorder. [12] Resistance to thyroid hormone: Feedback loop interrupted on the level of pituitary thyroid hormone receptors.

  5. Thyroid disease - Wikipedia

    en.wikipedia.org/wiki/Thyroid_disease

    When circulating in the body, T3 and T4 are bound to transport proteins. Only a small fraction of the circulating thyroid hormones are unbound or free, and thus biologically active. T3 and T4 levels can thus be measured as free T3 and T4, or total T3 and T4, which takes into consideration the free hormones in addition to the protein-bound hormones.

  6. Thyroid - Wikipedia

    en.wikipedia.org/wiki/Thyroid

    However, as the two thyroid hormones travel bound to other molecules, and it is the "free" component that is biologically active, free T 3 and free T 4 levels can be measured. [84] T 3 is preferred, because in hypothyroidism T 3 levels may be normal. [84] The ratio of bound to unbound thyroid hormones is known as the thyroid hormone binding ...

  7. Euthyroid sick syndrome - Wikipedia

    en.wikipedia.org/wiki/Euthyroid_sick_syndrome

    [22] [23] 3,5-T2 levels were also observed to correlate with concentrations of rT3 (reverse T3) [22] in patients with euthyroid sick syndrome. NTIS is a component of a complex endocrine adaptation process, so affected patients might also have hyperprolactinemia and elevated levels of corticosteroids (especially cortisol ) and growth hormone .

  8. Thyroid hormones - Wikipedia

    en.wikipedia.org/wiki/Thyroid_hormones

    A related parameter is the free thyroxine index, which is total T 4 multiplied by thyroid hormone uptake, which, in turn, is a measure of the unbound TBG. [75] Additionally, thyroid disorders can be detected prenatally using advanced imaging techniques and testing fetal hormone levels. [76]

  9. Hashimoto's thyroiditis - Wikipedia

    en.wikipedia.org/wiki/Hashimoto's_thyroiditis

    As the free amount reflects the amount available to body tissues, the most treatment-relevant measures for thyroid disorders are Free T 3 and Free T 4. [68] Typically, Free T 4 is the preferred test for hypothyroidism, [ 69 ] as Free T 3 immunoassay tests are less reliable at detecting low levels of thyroid hormone, [ 70 ] and they are more ...