The CK-MB (Creatine Kinase-MB) test measures the amount of the CK-MB enzyme in your blood, a key indicator for diagnosing heart muscle damage, especially heart attacks (myocardial infarction), by detecting its release from injured heart cells. Also called CPK-MB, this test helps differentiate heart injury from skeletal muscle issues, with elevated levels suggesting cardiac stress, often alongside symptoms like chest pain and shortness of breath, though it’s usually done in conjunction with other cardiac markers