An echocardiogram is a medical test that uses sound waves to create images of the heart. This non-invasive procedure helps doctors assess the heart's structure and function, including the size of the heart chambers, the condition of the heart valves, and the blood flow through the heart. During the test, a technician places a small device called a transducer on the chest, which sends out sound waves. These waves bounce off the heart and return to the transducer, creating real-time images that can be viewed on a monitor. An echocardiogram is often used to diagnose heart conditions and monitor heart health.