blood creatine kinase activity level plasma creatine kinase activity level 2014-03-11T14:14:23Z CMO:0002243 JSmith The amount of enzymatic activity of creatine kinase (CK) enzyme in a specified sample of plasma. CK catalyses the reversible transfer of phosphate between ATP and various phosphogens such as creatine phosphate. Plasma CK level is used as an enzymatic marker for myocardial infarction, rhabdomyolysis and acute renal failure. clinical_measurement_ontology plasma CK activity level plasma CPK activity level plasma creatine phosphokinase activity level