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. 1980 Nov;12(11):611-4.
doi: 10.1055/s-2007-999212.

Direct measurement of free thyroxine in patients with T3-toxicosis

T Lin, H R Nankin

Direct measurement of free thyroxine in patients with T3-toxicosis

T Lin et al. Horm Metab Res. 1980 Nov.

Abstract

Circulating levels of free thyroxine were directly measured using a new kinetic radioimmunoassay system. Free thyroxine was abnormally elevated in: 1) each of eleven hyperthyroid individuals having elevated concentrations of thyroxine and triiodothyronine; and 2) all five hyperthyroid subjects who had normal circulating levels of thyroxine but elevated concentrations of triiodothyronine (T3-toxicosis). Using this assay system, free thyroxine appears to be elevated in all hyperthyroid individuals.

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