An Echocardiogram is a type of Ultrasound that checks the structure and function of the heart.
A nuclear stress test is an imaging test that shows how blood goes to the heart at rest and during exercise.
A Graded Exercise Stress Test (GXT) or Exercise Treadmill Test (ETT) allows doctors to observe the ability of the patient to perform cardiovascular exercise (functional capacity).
Stress echocardiography (ultrasound) is a test that uses ultrasound imaging to show how well your heart muscle is working as it pumps blood to your body.