It uses harmless, high frequency sound waves known as ultrasound. Ultrasound is beyond the range that people can hear. A device directs ultrasound toward the heart. It records the waves that echo off tissues. This produces an image on a screen called an echocardiogram.
Similar tests can view various internal organs and unborn fetuses.
Echocardiography shows the size, shape, and motion of the heart structures. It also graphs the cycle of pumping and valve movement. It is useful for evaluating people with chest pain, abnormal chest x-rays, or abnormal heartbeats. The test is safe and painless. It usually lasts 15 to 30 minutes.