title: Radioimmunoassay of 3,3',5'-triiodothyronine (reverse T3) on small reusable sephadex columns.
abstract: A simple radioimmunoassay for serum reverse triiodothyronine on small reusable Sephadex G 25 fine columns has been developed. The assay was unaffected by serum volumes of up to 100 microliter. The recovery of reverse T3 added to serum was in the mean 98.3 +/- SEM 3.2% and the coefficient of variation within and between assay determinations 5.4% and 7.5%, respectively. The detection limit was 2.2 pg reverse T3/column. Serum reverse T3 in 58 euthyroid controls was in mean 48 +/- SD 9 ng/100 ml, and was positively correlated to age (P less than 0.001). No overlap was found between the control group, and the hypo- and hyperthyroid group respectively. Three patients with T3-toxicosis had a normal serum rT3.
mesh_terms: D000327:Adsorption; D000328:Adult; D000368:Aged; D002850:Chromatography, Gel; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011485:Protein Binding; D011863:Radioimmunoassay / Q000379:methods*; D013959:Thyroid Diseases / Q000097:blood; D013974:Thyroxine / Q000097:blood; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D014284:Triiodothyronine; D013974:Thyroxine