What tests are needed to further define the (Heart disease- Congenital) condition?

The most common test is an echocardiogram. This test uses sound waves to visualize the structures of the heart. In almost all cases, a clear diagnosis can be made based on the findings of an echocardiogram. Other tests that are often performed include pulse oximetry (checking the oxygen level in the blood), electrocardiography (assessing the heart’s electricity), and a chest X ray to visualize both the heart and lungs.