An echocardiogram, or echo for short, is a sonogram of your heart. During this test you will be asked to lie on your left side, while pictures are taken of your heart using an ultrasound transducer. You may be asked to hold your breath in order to obtain the best images possible. An echo allows us to see the overall size, structure, and function of your heart and heart valves. There are no special instructions prior to having an echo. This test will take up to 45 minutes.