There are stages that are used primarily for research purposes that grade the level of cardiac involvement (AHA) and another that categorizes your limitation in daily activities. There are also mobility and balance tests that are sometimes used to measure ability and limitations. But not all clinics nor specialists use them. And as far as I know that are not prognostic.

Yes. I believe there are 3 stages and they are related to your troponin and bnp blood tests. Paula would probably know more