title: [Discrepancy in CEA levels of different kits].
mesh_terms: D002272:Carcinoembryonic Antigen / Q000032:analysis*; D006801:Humans; D011933:Reagent Kits, Diagnostic / Q000592:standards*
chemical_list: D002272:Carcinoembryonic Antigen; D011933:Reagent Kits, Diagnostic