Free thyroxine RIA concentration (gammacoat) is spuriously elevated in blood collected in silicon-coated vacutainer tubes.
D001800:Blood Specimen Collection / Q000592:standards*; D006801:Humans; D011863:Radioimmunoassay; D011933:Reagent Kits, Diagnostic; D012825:Silicon; D013974:Thyroxine / Q000097:blood*
D011933:Reagent Kits, Diagnostic; D013974:Thyroxine; D012825:Silicon