Yes it is required for you to do the test as to rule out any coronary blocks and to see the percentage of blocks if any. As with most procedures done on your heart and blood vessels, a coronary angiogram has some risks, such as radiation exposure from the X-rays used. Major complications are rare, though. Potential risks and complications include: - Heart attack - Stroke - Injury to the catheterized artery - Irregular heart rhythms (arrhythmias) - Allergic reactions to the dye or medications used during the procedure - Kidney damage - Excessive bleeding - Infection These potential side effects are rare.