A troponin test measures the levels troponin T or troponin I proteins in the blood. Troponins are specific proteins found in heart muscle. Troponin testing is done to diagnose heart attacks (myocardial infarctions). Troponin tests are primarily ordered to evaluate people who have chest pain to see if they have had a heart attack or other damage to their heart. The more damage there is to the heart, the greater the amount of troponin T and I there will be in the blood. Troponin tests are sometimes ordered along with other cardiac biomarkers, such as CK–MB or myoglobin.