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Feel free to reach out to us for further information!
IAME is accredited by ACCME to provide AMA PRA Category 1 Credit™ for physicians and healthcare professionals.
We operate in North America, Australia, and South Korea.
© 2026 Institute for Advanced Medical Education, All Rights Reserved.
By Institute for Advanced Medical Education
Left ventricular ejection fraction is the number most clinicians look for on a cardiac ultrasound report. Echocardiography for ejection fraction is first-line because it is available, repeatable, and paired with chamber size, wall motion, valves, and filling data in the same study. This guide covers how to measure left ventricular ejection fraction (LVEF) on transthoracic echocardiography (TTE), how quantitative methods compare with visual estimate, commonly cited cutoffs used in heart failure care, and the pitfalls that make an EF untrustworthy.
LVEF is stroke volume divided by end-diastolic volume, expressed as a percentage. On transthoracic echocardiography, that percentage is only as good as a true long-axis view, a visible endocardial border, and a method that matches the ventricle in front of you. Use a quantitative method whenever image quality allows, then reconcile it with an integrated visual assessment from multiple views.
Core acquisition includes parasternal long axis, short axis at several levels, apical four-chamber, apical two-chamber, and apical long axis. The apex must not be foreshortened. If the true apex is off-axis, volumes fall and EF is often overestimated. Set depth, gain, and focus so the endocardium is a continuous line. Laboratories building a consistent TTE protocol can start with an introduction to echocardiography curriculum before relying on any single EF method.
Two-dimensional biplane Simpson calculation is the workhorse quantitative method in most laboratories. Trace the endocardial border in apical four-chamber and two-chamber views at end-diastole and end-systole. Software divides the cavity into stacked disks, sums the volumes, and computes EF from the two planes.
Practical tracing tips:
Teichholz-type linear formulas estimate volumes from a basal dimension and assume an ellipsoid ventricle. That assumption fails in coronary disease, aneurysm, asymmetric hypertrophy, and many postoperative hearts. Linear EF can be a quick sanity check. It should not be the sole reported method when apical windows are adequate.
When image quality permits, three-dimensional echocardiography reduces geometric assumptions and can improve reproducibility compared with 2D disks. It still needs a complete endocardial surface and a reasonably stable rhythm. Contrast-enhanced TTE is indicated when two or more contiguous segments are not well seen. Contrast often turns an unreliable visual guess into a defensible Simpson or 3D EF. If windows remain inadequate after contrast, transesophageal echocardiography may define ventricular function in an appropriate setting. Cardiac magnetic resonance is the usual reference standard when an exact EF will change a device or cardiotoxic-therapy decision.
Experienced readers still grade systolic function by eye, and a skilled visual estimate from multiple views can track closely with quantitative EF. It is most defensible when anchored to a measured value, not used as a substitute for tracing when tracing is possible. Visual estimate is also how you catch a number that cannot be right. A measured EF of 55% with an akinetic apex and a dilated ventricle should send you back to the loops.
There is no single universal normal EF. ASE-style chamber quantification guidance uses sex-specific ranges that are slightly higher in women than in men. In broad terms, many laboratories treat an LVEF in the mid-50s to low 70s as normal, with men often cited around 52% to 72% and women around 54% to 74%. Mildly reduced values commonly occupy the low 40s to about 50% or the low 50s, moderate reduction around 30% to 40%, and severe reduction below 30%. Patient-facing sources often quote 55% to 70% or 50% to 70% as normal. Name the method on the report and avoid implying precision the images do not support.
Heart failure echocardiography is still organized around EF phenotype because therapy and trial evidence stratify that way:
EF is necessary but not sufficient. A normal EF does not exclude heart failure. Diastolic assessment, left atrial size, estimated pulmonary pressures, valvular disease, and right ventricular function belong in the same interpretation. Stroke volume can be low even when EF is preserved, especially in a small, hypertrophied ventricle. Severe mitral regurgitation can make EF look more reassuring than forward output. Echocardiography for heart failure also means looking for cause. Regional wall motion suggests ischemic disease. Low-flow, low-gradient aortic stenosis with reduced EF is a setting in which EF, stroke volume index, and valve gradients must be read together.
Treat every EF as a measurement with error bars. These problems systematically distort TTE results:
If the quantitative EF and the visual impression disagree, do not average them in silence. Recheck foreshortening, end-systolic timing, and whether contrast is indicated, then report the limitation.
Global longitudinal strain is not a replacement for EF, but it can detect impaired systolic function when EF is still numerically normal, particularly during cardiotoxic therapy surveillance. Report vendor and tracking quality when strain is included.
A useful LVEF statement is more than a percentage. Include the numeric EF and method (biplane Simpson, 3D, contrast-enhanced, or visual estimate only), image quality, rhythm and whether beats were averaged, LV size and regional wall motion, comparison with the prior study using the same method when possible, and associated findings that change the meaning of EF, including mitral regurgitation, aortic stenosis, right ventricular function, and filling pattern.
Do not report EF to a false single percentage point when the study is technically difficult. A range such as 30% to 35% is more honest than 33% from a poor trace. Qualitative terms such as severely reduced should still be tied to a numeric range so referring clinicians can apply heart failure pathways consistently.
Quantitative LVEF on TTE is only as good as the views, the border, and the honesty of the report. Use biplane or 3D methods when you can, add contrast when you cannot see the endocardium, and interpret the percentage next to geometry, valves, and the clinical syndrome. IAME offers accredited ultrasound CME courses on echocardiography technique and interpretation.
Accuracy depends on image quality, whether contrast or 3D was used, ventricular geometry, and reader experience. With good apical windows and a biplane or 3D method, TTE is adequate for most clinical decisions and is the usual test for serial follow-up. When EF will determine a major therapy threshold and the echocardiogram is technically limited, cardiac magnetic resonance or another volumetric method is often used to confirm the value.
Yes. An LVEF of 60% falls within commonly cited normal ranges for both men and women, including ASE-style sex-specific intervals and the 50% to 70% or 55% to 70% ranges used in many clinical discussions. Normal EF does not by itself exclude heart failure with preserved EF, valvular disease, or regional wall motion abnormalities. Interpret 60% together with symptoms, chamber size, diastolic parameters, and the rest of the study.
Cardiac magnetic resonance is generally treated as the reference standard for LV volumes and EF because it does not rely on acoustic windows or simple geometric assumptions. Echocardiography remains the first test because it is available at the bedside and provides valves, pericardium, and hemodynamics in one examination. Nuclear ventriculography and contrast ventriculography can also quantify EF when those studies are otherwise indicated.
Some causes of reduced EF are reversible or partly reversible, including ischemia that is revascularized, tachycardia-mediated cardiomyopathy, toxin exposure, inflammation, and peripartum cardiomyopathy, among others. In chronic HFrEF, guideline-directed medical therapy and device therapy when indicated can improve EF in many patients, but improvement is not guaranteed and is not a substitute for treating the underlying disease. Management decisions belong with the treating clinicians and current society guidelines, not with an isolated imaging number.
Severe reduction is commonly described as LVEF below 30%, and very low values raise concern for pump failure, arrhythmia risk, and advanced therapy evaluation. There is no single percentage that is dangerous in isolation. A compensated patient with an EF of 25% differs from a patient with the same EF in cardiogenic shock. Symptoms, filling pressures, blood pressure, arrhythmias, and etiology drive urgency more than the integer itself.
Routine reporting does not use an age-by-age EF chart. ASE-style reference ranges are primarily sex-specific rather than decade-specific, and a value that is normal at age 40 is not reinterpreted as abnormal at age 70 solely because of age. Aging is more consistently associated with changes in diastolic function, aortic stiffness, and wall thickness than with a large expected drop in EF. If an older adult has a borderline or reduced EF, evaluate it as reduced rather than dismissing it as normal for age.
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Feel free to reach out to us for further information!
IAME is accredited by ACCME to provide AMA PRA Category 1 Credit™ for physicians and healthcare professionals.
We operate in North America, Australia, and South Korea.
© 2026 Institute for Advanced Medical Education, All Rights Reserved.
