This is the "gold standard" (best) test for assessing coronary artery disease. It will allow the cardiologist to assess the severity and extent of coronary disease. This is helpful in deciding the best treatment for patients. It may mean recommending medication alone, mediation and a stent or medication and a bypass operation. The results of the test will be discussed with you at the end of the test. A video explaining the procedure is available by following this link below. Generally it is a safe procedure, the risk of a serious complication is approximately 1/1000. Your cardiologist will explain the procedure before hand. Its important for you to let your doctor know if you are allergic to iodine, are on blood thinners, are diabetic or have kidney disease.