title: Radioimmunoassay of triiodothyronine in unextracted human serum.
abstract: Serum triiodothyronine (T-3) concentrations have been estimated by radioimmunoassay using unextracted serum. The serum T-3 concentrations have been shown to be similar in two separate European populations (0.76-1.67 ng/ml). Raised T-3 values have been observed in all subjects with hyperthyroidism. Low values are seen in hypothyroidism although there is some overlap with the normal range. There is a good correlation between serum T-3 and serum thyroxine (T-4) concentrations, and estimation of T-3 seems likely to prove a practical and reliable test of thyroid function.
mesh_terms: D000328:Adult; D000818:Animals; D006801:Humans; D006980:Hyperthyroidism / Q000097:blood*; D007037:Hypothyroidism / Q000097:blood*; D007456:Iodine Isotopes; D008722:Methods; D011817:Rabbits / Q000276:immunology; D011863:Radioimmunoassay; D013960:Thyroid Function Tests; D013974:Thyroxine / Q000097:blood; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D007456:Iodine Isotopes; D014284:Triiodothyronine; D013974:Thyroxine