Creatine kinase

Creatine kinase is an enzyme that uses ATP to convert creatine into phosphocreatine and adenosine diphosphate.

A study found increased levels of creatine kinase in the muscle biopses of patients with postviral fatigue syndrome.

Creatine kinase is a marker of tissue damage. Elevated levels are found in patients suffering from heart attack, severe muscle breakdown, and muscular dystrophy.