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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 .
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).
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.
The pituitary gland secretes thyrotropin (TSH; Thyroid Stimulating Hormone) that stimulates the thyroid to secrete thyroxine (T4) and, to a lesser degree, triiodothyronine (T3). The major portion of T3, however, is produced in peripheral organs, e.g. liver, adipose tissue, glia and skeletal muscle by deiodination from
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.
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]
Binding of the antibody to the amino terminus of the TSH receptor shows stimulatory activity, whereas binding to residues 261-370 or 388-403 block the activity. TRAbs are present in 70–100% of Graves' disease (85–100% for activating antibodies and 75–96% for blocking antibodies) and 1–2% of normal individuals.
Also called serum glutamic pyruvic transaminase ... (TSH or thyrotropin) Adults – standard range: ... Serum free light chains (FLC): kappa/lambda ratio: 0.26 ...
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