Cardiac biomarkers are substances found in the blood, released when the heart muscle is damaged or stressed. Medical professionals use blood tests to measure these biomarkers to diagnose conditions like heart attacks (myocardial infarction), heart failure, and acute coronary syndrome (ACS), as well as to assess risk and manage treatment. Common examples include cardiac troponin (the most sensitive marker for a heart attack), creatine kinase-myocardial band (CK-MB), and B-type natriuretic peptide