The echo cardiograph (ECG) is carried out order to check for possible abnormalities in the heart. The test uses sound waves (ultrasound) to create images of different parts of the heart. The doctor can interpret these pictures to check for damage due to high blood pressure, irregular heart rhythm, diagnose poor blood flow to the heart and heart attacks, and enlargement in any part of the heart. It helps in measuring the size and shape of the heart and the thickness of the heart muscles. Various types of the test exist, such as stress echocardiography, transesophageal echocardiography, fetal echocardiography and transthoracic echocardiography.