80 to 90% that a stress test will pick it up. not 100%. they miss the problem and they'll sometimes tell you -- >> what should you do to find out you if you test will pick it up. not 100%. stress tests miss the problem and will sometimes you have it when you don't have it. >> what should you do if you have narrowing of the arteries? >> other things you can do besides a stress test. we talked about calcium scoring, a c.t.angiogram. and it's a test that examines function. norts it's -- in other words, it's practical. saying hey, if you want to run a marathon, do it under circumstances where we can control it. that's what i like about it. >> david. >> and he deals with this a lot more, but it's good for what are the indications of a stress test. i want to play a little devil's