The normal value of ckmb, monitoring methods are different, the normal range is different, the normal value measured by enzyme immunofluorescence method is 0.8-5.0 micrograms per milliliter; the normal range measured by enzyme rate method is 0-18 units per liter; the normal range measured by immunosuppression method is 0-25 units per liter; there is also the normal value measured by electrophoresis method is less than 5%, of which enzyme immunofluorescence method and immunosuppression method are more commonly used. ckmb that is creatine kinase isoenzyme, ckmb increase is mainly seen in acute myocardial infarction, myocarditis, muscle damage caused by strenuous exercise, progressive and malnutrition. ckmb increase needs to be combined with troponin as well as clinical symptoms and ECG to determine whether there is myocardial infarction. If it is strenuous exercise, caused by the increase of myoenzymes, often dominated by the increase of CK, oral statins can also cause the increase of myoenzymes, often accompanied by muscle pain.