Transthoracic Echocardiogram (TTE) is a test done to visualize the heart muscle as it pumps, and the valves in the heart as they open and close. During the test, sound waves are measured as they bounce off the structures of the heart. This is done by applying a hand-held device (transducer) to the skin of the chest over the area of the heart. The test is painless and takes about 30 minutes to complete. The test is used to detect abnormal heart valve function and poor pumping function of the heart, and to identify blood clots within the heart chambers or tumors in the heart.