Skip to Content
Home > Wellness > Health Library > Ejection Fraction
The ejection fraction is a measurement of the heart's efficiency
and can be used to estimate the function of the left ventricle, which pumps
blood to the rest of the body.
The left ventricle pumps only a fraction of the blood it contains.
The ejection fraction is the amount of blood pumped divided by the amount of
blood the ventricle contains. A normal ejection fraction is more than 55% of
the blood volume. If the heart becomes enlarged, even if the amount of blood
being pumped by the left ventricle remains the same, the relative fraction of
blood being ejected decreases. For example:
Current as of:
February 20, 2015
Rakesh K. Pai, MD, FACC - Cardiology, Electrophysiology & Stephen Fort, MD, MRCP, FRCPC - Interventional Cardiology
How this information was developed to help you make better health decisions.
To learn more, visit Healthwise.org
© 1995-2015 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.