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An ejection fraction (EF) is the volumetric fraction (or portion of the total) of fluid (usually blood) ejected from a chamber (usually the heart) with each contraction (or heartbeat).

An EF below 40 percent is considered low. This may show that a person has heart failure with reduced ejection fraction (HFrEF) or cardiomyopathy — an enlarged, thick, or stiff heart muscle. A lower EF means that the heart’s pumping action is weaker.

Ejection fraction (EF) measures the amount of blood pumped out of your hearts lower chambers, or ventricles. Its the percentage of blood that leaves your ventricle when your heart contracts.

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