Also known as creatine phosphokinase, creatine kinase is a blood biochemical test. Creatine kinase is mainly found in cardiac muscle, skeletal muscle, and partly in smooth muscle and brain tissue, and can be examined by drawing blood for cardiac enzyme profiling, which belongs to the category of blood biochemical tests. Changes in creatine kinase results can help determine whether there is damage to cardiac or skeletal muscle and the severity of the disease. Normal values for creatine kinase range from 50 to 310 U/L for men and 40 to 200 U/L for women. If the test result in the report card is found to be elevated or lower than the normal reference range, it is necessary to consult a doctor promptly to identify the cause. Serum creatine kinase test can only be used as an auxiliary examination of the disease, if the test results are abnormal, it is also necessary to improve other tests to understand the cause of the disease, and timely to the hospital for treatment.