Creatine kinase is an important indicator to screen for normal function of multiple organs, tissues and organs in the body through blood tests. For example, in heart problems such as acute myocardial infarction or acute myocarditis, the creatine kinase may increase significantly, and in cases of rhabdomyolysis due to excessive exercise or incorrect exercise, the creatine kinase may also increase significantly. In addition, in patients with hypothyroidism, an increase in creatine kinase may also occur when tissue swelling and damage to muscle cells occur. Therefore, creatine kinase is a standard test to check for abnormalities in the function of the aforementioned target organs through blood tests.