It simply means that if you suspect reinfarction, get Trop I levels evaluated

It simply means that if you suspect reinfarction, get Trop I levels evaluated. Then repeat the test after 3-6 hours, if there is reinfarction, the second titre would rise by >/= 20%

Ya but what about part B?

If the titre doesn’t rise by >/= 20%, suspect new onset MI

Yea, but what is the logic here? In new onset MI why doesn’t the titer rise?