My stress test/echo cardiogram from 3 days ago suggests i have a (or some?) blocked arteries. I am otherwise a very fit, healthy 66 year old woman. I requested the rest t because I have occasional shortness of breath when I am doing very aerobic exercise. I'm now being referred to a cardiologist. Should I expect that the next step is a heart catharizatiom or is there something less invasive that should be done, like maybe get a calcium score?