Creatine Kinase (CK) Unit Converter

Creatine Kinase (CK), also known as Creatine Phosphokinase (CPK), is an enzyme found predominantly in tissues that consume high amounts of ATP, namely skeletal muscle, myocardium (heart muscle), and the brain. CK catalyzes the reversible transfer of a phosphate group from phosphocreatine to ADP, generating ATP for immediate energy use.

Clinically, total CK is a primary marker of muscle cell injury. Significant elevations are seen in rhabdomyolysis, trauma, vigorous exercise, or seizures. While CK was historically used to diagnose myocardial infarction, it has been largely superseded by the highly specific Troponin assays. The specific isoenzyme, CK-MB, remains useful for assessing cardiac injury in certain contexts. Results are reported in units of activity (U/L or $\mu\text{kat/L}$).