what does an angiagram tell
1 An angiogram can show how serious your coronary artery disease is and how best to treat it. 2  It shows if your coronary arteries are clogged, where they are clogged, and by how much. 3  The test can help your doctor see if you need treatment such as medicines, angioplasty, or coronary artery bypass surgery.uring an angiogram, a thin tube called a catheter is placed in an artery of your arm or leg and gently threaded up into your heart. A special dye goes through the catheter. The dye helps the arteries show up on the X-ray. The doctor checks the X-rays to see if your coronary arteries are narrowed or blocked.