free thyroxine index

free thy·rox·ine in·dex (FTI),

an arbitrary value obtained by multiplying the triiodothyronine uptake by the serum thyroxine concentration; it largely corrects for variations in thyroid-bound globulin concentration by providing a clinically valid estimate of the physiologically active free thyroxine; direct assay or laboratory measurement of free serum thyroxine yields a more accurate value.

free thyroxine index

FT₄I, T7 assay, T12 assay Endocrinology A lab value for T₃ uptake combined with total T₄; FTI is a clinical parameter measured by RIA, used to evaluate thyroid function, calculated by T₄ x %T₃RU–resin uptake; the FTI is ↑ in hyperthyroidism and factitious hyperthyroidism and ↓ in hypothyroidism; it is falsely ↑ in heparin therapy and falsely ↓ in phenytoin and valproic acid therapy, and in the euthyroid sick syndrome. See Thyroxine.

free thy·rox·ine in·dex

(frē thī-roksēn indeks) Arbitrary value obtained by multiplying the triiodothyronine uptake by the serum thyroxine concentration.

单词	free thyroxine index
释义	free thyroxine index free thy·rox·ine in·dex (FTI), an arbitrary value obtained by multiplying the triiodothyronine uptake by the serum thyroxine concentration; it largely corrects for variations in thyroid-bound globulin concentration by providing a clinically valid estimate of the physiologically active free thyroxine; direct assay or laboratory measurement of free serum thyroxine yields a more accurate value. free thyroxine index FT₄I, T7 assay, T12 assay Endocrinology A lab value for T₃ uptake combined with total T₄; FTI is a clinical parameter measured by RIA, used to evaluate thyroid function, calculated by T₄ x %T₃RU–resin uptake; the FTI is ↑ in hyperthyroidism and factitious hyperthyroidism and ↓ in hypothyroidism; it is falsely ↑ in heparin therapy and falsely ↓ in phenytoin and valproic acid therapy, and in the euthyroid sick syndrome. See Thyroxine. free thy·rox·ine in·dex (frē thī-roksēn indeks) Arbitrary value obtained by multiplying the triiodothyronine uptake by the serum thyroxine concentration. See FTI See FTI
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