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​Cardiac Catheterization is a test done by inserting a catheter (thin, flexible tube) into the heart, through an artery in the arm or leg, and injecting a dye into the heart arteries. The purpose of this test is to evaluate the heart valves and heart function, and to define any blockage in the coronary arteries that can restrict blood flow to the heart. Frequently this procedure is done as an outpatient procedure. The hospital and your provider’s nurse will inform you of specific test instructions.​