Differences between measurements of free thyroxin in serum from siliconized and nonsiliconized tubes are influenced by analyte concentration.
D001800:Blood Specimen Collection; D006801:Humans; D011863:Radioimmunoassay; D011933:Reagent Kits, Diagnostic; D012828:Silicones; D013974:Thyroxine / Q000097:blood*
D011933:Reagent Kits, Diagnostic; D012828:Silicones; D013974:Thyroxine