A protein substance, one of the cardiac markers or enzymes (as they were called earlier) assisting in the diagnosis of Myocardial Infarction.

As a general rule, enzymes are protein substances found normally in the Myocardium (heart muscle) cells.

When infarction occurs, i.e. when cells are destroyed, enzymes are released into the blood stream and their blood level increases. Therefore it is possible to use them as markers for the diagnosis of Myocardial Infarction.

Troponin levels begin to rise 6 hours after the start of infarction.

Its presence is a strong evidence of Myocardial Infarction and its blood level remains high for several weeks.