Your body produces the enzyme creatine kinase (CK) or creatine phosphokinase to keep your muscles functioning properly. Healthcare providers use the CK test to check levels of this protein in your ...

Background: The serum concentration of creatine kinase (CK) is used widely as an index of skeletal muscle fibre damage in sport and exercise. Since athletes have higher CK values than non-athletes, ...

The creatinine blood test helps doctors diagnose kidney disease. A poorly functioning kidney cannot filter creatinine as well as it usually does, which causes levels in the blood to rise.