Horm Metab Res 1980; 12(11): 611-614
DOI: 10.1055/s-2007-999212
© Georg Thieme Verlag, Stuttgart · New York

Direct Measurement of Free Thyroxine in Patients with T3-Toxicosis

T. Lin, H. R. Nankin
  • Medical Service, William Jennings Bryan Dorn Veterans' Hospital and Department of Medicine University of South Carolina School of Medicine Columbia, South Carolina, U.S.A.
Further Information

Publication History

1979

1980

Publication Date:
22 April 2008 (online)

Summary

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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