An ejection fraction (EF) is the volumetric fraction of blood ejected from a ventricle of the heart with each heartbeat; it is a measure of the pumping efficiency of the heart.
An ejection fraction (EF) is the fraction of blood ejected from a ventricle of the heart with each heartbeat. It is calculated by dividing the stroke volume by the end-diastolic volume, and is a volumetric measure of the pumping efficiency of the heart.