Muscle breakdown: Creatine PhosphoKinase (CPK or CK) is usually a marker of muscle tissue injury or death. Can come after injury or heavy lifting (lots of it) or intense exercise. 500s not very high or too concerning--addressed with increased fluids for day or two. 1000s more worrisome and 10K+ can definitely cause kidney injury (by "plugging up" the body's filter system).
Answered 4/13/2016
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