Just had an acquaintance go into Emergency last week. They pretty much took him straight to the cath lab to get scoped. 95% blockage in 1 artery and they put in a stent. I told him the good news is that he has now been scoped and knows for sure. One other artery at 35%, all others OK. The rest of us just walk around guessing.
But it has always amazed me that there is not a non-invasive method to determine what the scope can see. Why

The Coronary Calcium Scan is sort of like that but it can give false positives and negatives.