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Echocardiogram, often referred to as a cardiac echo or simply an echo, is a sonogram of the heart. (It is not abbreviated as ECG, an abbreviation for an electrocardiogram .) Echocardiography uses standard two-dimensional, three-dimensional, and Doppler ultrasound to create images of the heart.
1 Echocardiography (echo) is a painless test that uses sound waves to create pictures of your heart. 2  This test gives your doctor information about the size and shape of your heart and how well your heart's chambers and valves are working.ardiologists, or heart specialists, are trained to evaluate these images to assess heart function and provide a report of the results.The echocardiogram is just one of the many tests that can be done to evaluate heart anatomy and function. An electrocardiogram (EKG, ECG) is the most common heart tracing done.