This is a test, performed in the office, involving either an exercise stress test on a treadmill or a chemical stress test that uses a medication to make your heart rate higher. Following the stress portion of the test, a nuclear medicine technologist will inject you with a radioactive tracer and images will be taken of your heart, allowing the physicians to see which areas of your heart receive enough blood and which areas do not. This test is safe and effective in the diagnosing of blockages in the coronary arteries.