The MUGA test determines the effectiveness of the heart's pump function, and allows the physician to look at the wall motion of the heart. The MUGA scan procedure takes approximately one hour.
During the MUGA scan, a small amount of a radioactive substance or tracer (called a radionuclide) is put into your blood. The pictures show if areas of your heart muscle aren't contracting normally and show how well your heart pumps blood. These tests are often done while you're resting and exercising.