Ejection fraction (EF) is the percentage of blood volume ejected in each cardiac cycle and is a representation of LV systolic performance. It is calculated from the end-diastolic and end-systolic volumes of the left ventricle. The formula for calculating EF is: E F = E D V − E S V E D V.

How is ejection fraction measured?

Ejection fraction can be measured with imaging tests, including: Echocardiogram. This is the most common test used to measure ejection fraction. During an echocardiogram, sound waves are used to produce images of your heart and the blood pumping through your heart.

What is the most accurate test for ejection fraction?

A cardiac MRI is the most accurate test, but it is also the most difficult to perform. A CT scan or a cardiac catheterization can also measure the ejection fraction, although the measurement is typically a byproduct of those tests, rather than the primary purpose.