Knowing Your Ejection Fraction
by Cynthia M. Johnson, MA
Ejection fraction (EF) percentage is an important number for people with heart failure to know. It is a sign of how well your heart is pumping out (ejecting) blood.
Heart failure is a lasting health problem that needs to be treated. Your EF percentage is used to help choose treatment and find out how well it is working.
Testing Your EF
An echocardiogram is the most common test used to measure EF. It uses ultrasound to test how well the heart’s valves and muscle are working. It can also show how much blood is in your heart.
Other tests that may be used are:
Your heart fills with blood before it beats and pushes blood out to the body. Some blood will be pushed out to the body, some blood will stay in the heart. EF is a measure of how much blood was pushed out of the left side of the heart. EF describes how well your heart is pumping blood out to the rest of your body:
Low EF levels will cause shortness of breath and fatigue. It will also reduce blood flow to vital organs like brain, kidney, or lungs. If you have lower than normal levels you may be diagnosed with heart failure reduced ejection fraction (HFrEF).
Your care team will track EF levels to:
Preserved Ejection Fraction
Some people with heart failure may have a normal EF. This is called heart failure with preserved ejection fraction (HFpEF). The level of blood that passes out of the heart is still too low to support the body. EF is normal because the amount of blood that starts in the heart is lower than normal. This makes the percentage of blood that leaves the heart look normal. A thickened heart wall decreases the space to hold blood. Less blood is available to be pumped out.
Stay in Touch with Your Care Team
If you are having trouble handling heart failure, tell your care team right away. Some ejection fraction may be improved with treatment. Changes in EF may also need a change in the treatment plan and focus.
American Heart Association
Centers for Disease Control and Prevention
Heart and Stroke Foundation of Canada
Ejection fraction heart failure measurement. American Heart Association website. Available at: https://www.heart.org/en/health-topics/heart-failure/diagnosing-heart-failure/ejection-fraction-heart-failure-measurement. Updated May 31, 2017. Accessed May 6, 2019.
Heart failure with preserved ejection fraction. EBSCO DynaMed website. Available at: https://www.dynamed.com/topics/dmp~AN~T114099/Heart-failure-with-reduced-ejection-fraction. Updated November 19, 2018. Accessed May 6, 2019.
Heart failure with reduced ejection fraction. EBSCO DynaMed website. Available at: https://www.dynamed.com/topics/dmp~AN~T114099/Heart-failure-with-reduced-ejection-fraction. Updated April 16, 2019. Accessed May 6, 2019.
Last reviewed May 2019 by EBSCO Medical Review Board Peter Oettgen, MD
Last Updated: 10/16/2019
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