An echocardiogram ("echo") is an ultrasound of the heart. A small probe like a microphone, called a transducer, is placed on the chest in various places. The ultrasound waves sent by the transducer bounce off the various parts of the heart. A computer in the machine determines the time it takes for the sound wave to return to the transducer and generates a picture with the data.

During the test, you will lie on your back or left side on a stretcher for about 45 minutes while the pictures are being recorded. The echocardiographer will review the pictures before sending you home to be sure all the necessary information has been obtained.