title: Assay of free thyroxine in serum: a preliminary comparison of three commercial kits.
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D011247:Pregnancy; D011863:Radioimmunoassay / Q000379:methods; D011933:Reagent Kits, Diagnostic; D013974:Thyroxine / Q000097:blood*
chemical_list: D011933:Reagent Kits, Diagnostic; D013974:Thyroxine