What enzyme test indicates a myocardial infarction?

Troponin. The currently used, most accurate enzyme is troponin which comes in two varieties: troponin i (that's the letter "i") and troponin t. There's no major differences - some labs use one, some the other. Ck, also known as cpk, is also used but it's older, less sensitive, and less specific.

Related Questions

Is sTNT also a predictive test? So for instance it was normal yesterday are the chances small you will have an Myocardial infarction today?

No. troponins are not predictive of future events, per se. These labs are most useful at ruling out an acute heart attack here and now...not necessarily in 1-2 days etc. May I ask what someone your age is asking this question for? If worried for yourself, in your age group troponins would largely be unhelpful because the incidence of that kind of problem (heart attack) in your age group is so slim. Read more...
No. Troponin T is a protein in cardiac muscle. If there is damage to the heart muscle, it will be released into the bloodstream, and elevated levels can be measured in the blood. It is used to document the muscle damage that occurs in a heart attack, but it is not useful to predict chances of a future heart attack, since the levels are not elevated until damage has already occurred. Read more...