While Coronary Angiogram is the most comprehensive method to diagnose coronary artery disease, there are alternatives that could be used based on the patient's health condition and preferences. These alternatives include Stress Tests, CT Heart Scans, and non-invasive imaging tests.
However, these alternatives don't provide the same level of detail about the coronary arteries as a Coronary Angiogram. Therefore, your doctor will typically recommend a Coronary Angiogram if they suspect severe coronary artery disease or if other tests have not provided a definitive diagnosis.