Creatine kinase (CK) is an enzyme which consists of isoenzymes mainly of
the muscle (CK-M) and the brain (CK-B). CK exists in serum in dimeric form
as CK-MM, CK-MB, CK-BB and as macroenzyme. Elevated CK values are
observed in cardiac muscle damages and in skeletal muscle diseases.
Measurement of CK is used especially in conjunction with CK-MB for
diagnosis and monitoring of myocardial infarction.