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  2. Thyroid function tests - Wikipedia

    en.wikipedia.org/wiki/Thyroid_function_tests

    The total T4 is less accurate due to the large amount of T4 that is bound. The total T3 is measured in clinical practice since the T3 has decreased amount that is bound as compared to T4. [citation needed] Reference ranges depend on the method of analysis. Results should always be interpreted using the range from the laboratory that performed ...

  3. Thyroid hormones - Wikipedia

    en.wikipedia.org/wiki/Thyroid_hormones

    The thyroid system of the thyroid hormones T 3 and T 4 [1] Thyroid hormones are two hormones produced and released by the thyroid gland, triiodothyronine (T 3) and thyroxine (T 4). They are tyrosine-based hormones that are primarily responsible for regulation of metabolism. T 3 and T 4 are partially composed of iodine, derived from food. [2]

  4. 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.

  5. Helper/suppressor ratio - Wikipedia

    en.wikipedia.org/wiki/Helper/suppressor_ratio

    The T-Lymphocyte Helper/Suppressor Profile (Helper/Suppressor ratio, T4:T8 ratio, CD4:CD8 ratio) is a basic laboratory test in which the percentage of CD3-positive lymphocytes in the blood positive for CD4 (T helper cells) and CD8 (a class of regulatory T cells) are counted and compared.

  6. Thyrotroph Thyroid Hormone Sensitivity Index - Wikipedia

    en.wikipedia.org/wiki/Thyrotroph_Thyroid_Hormone...

    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 .

  7. Thyroid disease - Wikipedia

    en.wikipedia.org/wiki/Thyroid_disease

    Thyroid disease is a medical condition that affects the structure and/or function of the thyroid gland. The thyroid gland is located at the front of the neck and produces thyroid hormones [1] that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ. These hormones normally act in the body to ...

  8. Euthyroid sick syndrome - Wikipedia

    en.wikipedia.org/wiki/Euthyroid_sick_syndrome

    Stress suppresses TSH, [5] and alterations in thyroid hormone levels may arise in psychiatric illness. In major depressive disorder, an NTIS-like phenotype may be observed, with reduced T3 and increased rT3. T4 may be elevated, and TSH is usually normal, although TSH's normal circadian rhythm may be disrupted. [2]

  9. Thyroid-stimulating hormone - Wikipedia

    en.wikipedia.org/wiki/Thyroid-stimulating_hormone

    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]