Cardiac troponin T is a protein found in cardiac muscle cells and is released into the bloodstream when there is damage to the heart muscle, such as during a heart attack. Measuring levels of cardiac troponin T in the blood is a common test used to diagnose heart attacks and assess the severity of cardiac damage. Elevated levels of cardiac troponin T can indicate acute coronary syndrome, myocardial infarction, or other cardiac conditions. Monitoring cardiac troponin T levels can also help doctors determine the effectiveness of treatment and predict outcomes for patients with heart disease.