In order to solve the concealment carryover contamination in clinical chemistry assay,a versatile judgment standard and a solution for reagent carryover contamination were designed. The reagent carryover contamination of 930 combinations between 31 types in-vitro diagnostic kits of Bio Sino were evaluated by using automatic biochemical analyzer( Abbott c16000),and a new judgment standard was put forward which is conducive to finding out those concealed carryover contaminations. Then a special cleaning proce...