Anatomy And Physiology Diagnostic Imaging Practice Test

Left ventricular ejection fraction on echocardiography is a measure of how much of the blood in the left ventricle is pumped out with each heartbeat, expressed as a percentage. It is calculated from the ventricle’s volumes, typically using the Simpson’s biplane method from apical views: EF = (EDV − ESV) / EDV × 100. This value provides a snapshot of systolic function. The normal range is about 55–70%. Values in this window indicate preserved systolic function. If EF falls below roughly 50%, it suggests some degree of systolic dysfunction, with progressively lower values indicating more impairment. The other ranges either miss the typical lower or upper limits of normal or fall clearly into abnormal territory, so the 55–70% range best represents the standard normal for echocardiographic assessment.