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The page below is a sample from the LabCE course Cardiac Biomarkers. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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CK-MB Measurement and Ranges

CK-MB assays used in cardiac damage diagnosis are immunoassay measurements rather than enzyme assays that measure the activity of CK-MB itself. Recall that CK-MB is also present in skeletal muscle; therefore, skeletal muscle injury can cause CK-MB elevation. Some laboratories measure total CK and if elevated, reflex to CK-MB testing.
Normal CK-MB values for adults are typically < 5.0 ng/mL.