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Typically, the left ventricle is the heart's main pumping chamber that pumps oxygenated blood through the aorta to the rest of the body, so ejection fraction is usually measured only in the left ventricle (LV). An LV ejection fraction of 55 percent or higher is considered normal. An LV ejection fraction of 50 percent or lower is considered reduced.Ejection fraction typically refers to the left side of the heart. It shows how much oxygen-rich blood is pumped out of the left ventricle to most of the body’s organs with each contraction. LVEF helps determine the severity of dysfunction on the left side of the heart.