Chest X-ray to see if the heart is enlarged and if the lungs are congested with fluid.
Echocardiogram, an ultrasound test, to evaluate heart muscle function, to see how well the heart is pumping, and to detect problems with the heart valves that may cause heart failure. Ejection fraction (EF) also can be measured. EF is a measure of how much blood is pumped out of the heart with each beat, and how much blood pumps through the heart with each beat. A normal EF is generally greater than 50%, which means that over half of the blood volume in the heart's main pumping chamber is pumped out with each beat.
Radionuclide ventriculography to show the pumping function of the left and right ventricles (the heart's large pumping chambers) during heart contractions. This test can also measure EF. Rarely performed by itself, this test may be part of an exercise stress test.