What is the normal ejection fraction of the left ventricle?

The normal ejection fraction (EF) of the left ventricle is generally considered to be greater than 55%. Ejection fraction is a measure of how much blood the left ventricle pumps out with each contraction, relative to the total amount of blood in the ventricle before contraction. A normal ejection fraction indicates efficient cardiac function and the ability of the heart to deliver adequate blood to the body.

Values above 55% are associated with healthy myocardial performance, while lower values can indicate varying degrees of heart dysfunction. A normal range, as recognized by various clinical guidelines, begins around 55% and extends upwards, typically reaching about 60% to 70% in healthy individuals, which reinforces that anything over 55% is considered normal.

This means an EF above 55% indicates good systolic function, supporting the choice of greater than 55% as the correct answer for normal ejection fraction.