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An echocardiogram is a test that uses ultrasound waves to examine the heart. Because it is a non-invasive test, it is a safe and painless way to help doctors diagnose a number of abnormalities of the heart.n echocardiogram is a test that uses ultrasound waves to examine the heart. Because it is a non-invasive test, it is a safe and painless way to help doctors diagnose a number of abnormalities of the heart.
An echocardiogram (echo) is a test that uses high frequency sound waves (ultrasound) to make pictures of your heart. The test is also called echocardiography or diagnostic cardiac ultrasound. Quick facts. 1  An echo uses sound waves to create pictures of your heartâs chambers, valves, walls and the blood vessels (aorta, arteries, veins) attached to your heart. 2  A probe called a transducer is passed over your chest.