Normally, a regular stress test is combined with a echocardiogram (not electrocardiogram or EKG) - you lay on your side for a echo prior to the stress test, then after exercising on the treadmill (walking or running) in order to elevate your heart rate sufficiently, you immediately lay on your side, again, for another echo. These two combined constitute a stress test with echo. An echo by itself is not as useful in diagnosis of asymptomatic patients. Again, I am not a medical professional.

Many cardiologists do not think a CT works well as the calcium causes blooming on the imagery which makes it difficult to assess arterial conditions.