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  2. Thyroid function tests - Wikipedia

    en.wikipedia.org/wiki/Thyroid_function_tests

    The total T4 is less useful in cases where there could be protein abnormalities. 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.

  3. 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).

  4. Thyrotroph Thyroid Hormone Sensitivity Index - Wikipedia

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

    Sensitivity of TSH-producing pituitary cells to thyroid hormones; also a marker for the set point of thyroid homeostasis 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 .

  5. Thyroid-stimulating hormone - Wikipedia

    en.wikipedia.org/wiki/Thyroid-stimulating_hormone

    The therapeutic target range TSH level for patients on treatment ranges between 0.3 and 3.0 μIU/mL. [18] For hypothyroid patients on thyroxine, measurement of TSH alone is generally considered sufficient. An increase in TSH above the normal range indicates under-replacement or poor compliance with therapy.

  6. Jostel's TSH index - Wikipedia

    en.wikipedia.org/wiki/Jostel's_TSH_index

    Jostel's TSH index can be calculated with = ⁡ + from equilibrium serum concentrations of thyrotropin (TSH), free T4 (FT4) and a correction coefficient derived from the logarithmic standard model (β = 0.1345).

  7. Thyroid disease - Wikipedia

    en.wikipedia.org/wiki/Thyroid_disease

    Free T4 and total T3 can be measured when hyperthyroidism is of high suspicion as it will improve the accuracy of the diagnosis. Free T4, total T3 or both are elevated and serum TSH is below normal in hyperthyroidism. If the hyperthyroidism is mild, only serum T3 may be elevated and serum TSH can be low or may not be detected in the blood. [14 ...

  8. File:Reference ranges for TSH, FT4, JTI and SPINA-GT.svg

    en.wikipedia.org/wiki/File:Reference_ranges_for...

    English: Reference ranges for thyroid's secretory capacity (SPINA-GT) and Jostel's TSH index (TSHI or JTI) compared to 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.

  9. Hyperthyroidism - Wikipedia

    en.wikipedia.org/wiki/Hyperthyroidism

    People with hyperthyroid will typically "take up" higher than normal levels of radioiodine. Normal ranges for RAI uptake are from 10 to 30%. In addition to testing the TSH levels, many doctors test for T 3, Free T 3, T 4, and/or Free T 4 for more detailed results. Free T 4 is unbound to any protein in the blood.