Muscle injury: CPK or creatinine phosphokinase, is an enzyme found in 3 "flavors"- isoforms- found in the brain, muscle and heart that is released when the respective organ is damaged. Normal upper limit of nl depends on the lab, but generally is 120mcg/l. Elevation may be caused by numerous perturbations: heart attack; seizures; muscle damage; heavy exercise; hyperthyroidism; hypothyroidism; brain injury etc.
Answered 2/8/2020
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