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ejection fraction

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Left ventricular ejection fraction is usually determined by echocardiography or radiographic ventriculography.

The ejection fraction is:

stroke volume = (end diastolic volume - end systolic volume)

ejection fraction = stroke volume / end diastolic volume

The normal range for the ejection fraction is:

  • 63-77% for males
  • 55-75% for females (reference: Measurements in Cardiology)

An average ejection fraction of 67% corresponds in an adult to 70-80 ml of blood.

The ejection fraction is a good predictor of longevity in patients with heart failure but does not correlate with symptomatic limitation.