The Full form of CAG is Coronary Angiogram. CAG is a procedure that uses a special dye (contrast material) and x-rays to see how blood flows through the arteries in your heart. It is a procedure performed on the vessels in the heart. In Angiogram ‘Gram’ in Latin refers to a measure and ‘Angio’ in Greek refers to blood vessel. So, Angiogram refers to analysis or record the condition of blood vessels. Coronary Angiogram or Angiography is a process where X-rays are used to study the condition of blood vessels in the arms, chest, or head. If there is any obstruction of the blood vessels in the body, it is identified, recorded and reported to the consulting Cardiologist / Doctor. Pregnant women and people with a history of asthma, diabetes and kidney problems are not considered for Angiogram. Coronary angiography is often done along with cardiac catheterization. This is a procedure which measures pressures in the heart chambers. CAG shows where the arteries are narrowed or blocked. It is performed to detect obstruction in the coronary arteries in patients with chest pain or angina. It may also be performed as next course of treatment when the patient has had a heart attack.