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.