This test uses sound waves to create a moving picture of your heart. Echocardiogram provides information about the size and shape of your heart and how well your heart chambers and valves are functioning. The test also can identify areas of poor blood flow to the heart, areas of heart muscle that are not contracting normally, and previous injury to the heart muscle caused by poor blood flow. An echocardiogram is a safe, noninvasive test. To perform the test, a special gel is placed on the chest wall and a transducer is then moved over the gelled areas to produce images for interpretation.