SUMMARY AND EXPLANATION OF THE TEST Creatine kinase isoenzymes MB (CK-MB) detection kit (CLIA) (hereinafter referred to as the kit) is used for the in vitro quantitative determination of CK-MB concentration in human serum. Creatine kinase is a dimer occurring in various in three isoenzymic forms, depending on the particular combination of its non-identical subunits:BB(brain type);MM(skeletal type); and MB(hybrid type). Creatine kinase isoenzymes MB is released into circulation later than myoglubin, reaching abnormal levels within 4 to 6 hours after onset of symptoms,it reaches its highest level with a typical range of 39-185 ng/mL after about 18 to 24 hours,and returns to normal in about 2 to 3 days.CK-MB is widely recognized as the traditional marker for the diagnosis of AMI.