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  • Title: Radioimmunoassays of T3, r-T3 and r-T'2 in human serum.
    Author: Skovsted L.
    Journal: Acta Med Scand Suppl; 1979; 624():19-24. PubMed ID: 284709.
    Abstract:
    Simple radioimmunoassays for 3,3',5-triiodothyronine (T3), 3,3',5'-reverse-triiodothyronine (r-T3) and 3,3'-diiodothyronine (r-T'2) in human serum are described. The princple of the methods is the same and based on a system using 8-anilino-1-naphthalene sulfonic acid as an inhibitor of nonspecific protein binding, a simultaneous addition of the antibody and the labelled hormone, an overnight incubation at room temperature and a separation of bound and free hormone with dextran-coated charcoal. The methods require 15 microliter, 50 microliter and 100 microliter (or 333 microliter for ethanol extraction) serum respectively. Serum concentrations (mean +/- SD) of T3, r-T3 and r-T'2 from normal subjects are 144 +/- 19 ng T3/100 ml (n = 52), 32 +/- 7 ng r-T3/100 ml (n = 36), 3.8 +/- 0.7 ng r-T'2/100 ml (ethanol extraction, n = 18) and 8.2 +/- 1.6 ng r-T'2/100 ml (unextracted, n = 16).
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