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Ejection fraction (EF) is the fraction of outbound blood pumped from the heart with each heartbeat. It is commonly measured by echocardiogram and serves as a general measure of a person's cardiac function. Ejection fraction is typically low in patients with Systolic congestive heart failure. Ejection fraction is a similar but distinct mathematical model when compared to stroke volume, which (along with heart rate) determines cardiac output, which is the amount of blood the heart pumps per minute. Mathematical models of Volume vs. Time are well documented in the encyclopedia.
Ask a Texas Heart Institute Doctor Informed patients make better patients. Question: What is the normal result for left ventricular ejection fraction (LVEF)? Is normal ejection fraction 50-70, or 55-70? I've seen a lot of articles that disagree on what is a normal EF. While anything >55 is normal and anything <50 is abnormal, what about that grey area of 50-54% EF? And is EF very complex to measure?