The ejection fraction is a measurement of the capacity at which your heart is pumping. According to the Mayo Clinic, during each heartbeat cycle, the heart contracts and relaxes. When your heart contracts, it ejects blood from the two pumping chambers (ventricles). When your heart relaxes, the ventricles refill with blood. No matter how forceful the contraction, it doesn’t empty all of the blood out of a ventricle. The term “ejection fraction” refers to the percentage of blood that’s pumped out of a filled ventricle with each heartbeat.
Because the left ventricle is the heart’s main pumping chamber, ejection fraction is usually measured only in the left ventricle (LV). A normal ejection fraction value for the left ventricle is 55 to 70 percent. Your ejection fraction value may decrease if your heart has been damaged by a heart attack or other problems with the heart valves or muscle.
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