The nurse is caring for a patient with a skeletal muscle disorder. The nurse reviews the patient's lab results and expects which creatine phosphokinase isoenzyme to be elevated?


• Creatine phosphokinase, or creatine kinase (CK) is an enzyme that is released from tissue after injury. CK-MM is expressed during skeletal muscle disease.

• CK-BB is expressed in the brain, but has little clinical relevance. 

• CK-MB is reflective of cardiac muscle damage. 

• CK-MK does not exist.

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