I have a Cardiologist that wants to do a cardiac catheterization and is talking about I probably need a stent put in because I didn't pass my chemical stress test. I have let him know before that I am highly allergic to the radioactive dye, and I almost pass out. But he won't tell me what my ejection fraction is with my echocardiogram. He said they don't go by that. He won't even do a CT Scan to see if there is a blockage first. Are there other ways to have ejection fractions done besides a chemical stress test?