Creatine kinase is an enzyme that’s responsible for ... Elevated levels of CK-MM can mean you have skeletal muscle damage, which may be due to a muscular disease or acute injury.

Creatine kinase ― also known as creatine phosphokinase, or CPK ― is a muscle enzyme that exists as isoenzymes. The MB type is specific to myocardial cells, whereas MM and BB are specific to ...