what's your ejection fraction (EF)? The proportion, or fraction, of blood pumped out of your heart with each beat is called the ejection fraction. A normal heart pumps out a little more than half the heart's volume of blood with each beat. A normal EF is 55 percent or higher. Your doctor can order simple, painless tests such as an echocardiogram that creates a moving picture of your heart using harmless soundwaves, or a nuclear medicine test that shows how well your heart is pumping. If your EF is abnormally low, you may need further tests to see if you have an abnormal heart rhythm.