A 2D echo report translates ultrasound images of your heart into a set of measurements covering chamber sizes, wall motion, valve function, and blood flow. The most commonly referenced number is the left ventricular ejection fraction, or LVEF, which tells you what percentage of blood the heart pumps out with each beat. But a full report contains dozens of values, and understanding even a handful of them turns a confusing document into a useful snapshot of how your heart is performing. Most of the numbers fall into a few intuitive categories once you know what each section is tracking.
Ejection Fraction, the Headline Number
Ejection fraction is the first thing most people look for, and the first thing most doctors discuss. It represents the proportion of blood that leaves the left ventricle each time the heart contracts. A pooled analysis of over 10,000 healthy adults found that the average LVEF sits around 63%, with a normal lower limit near 52%. Women tend to run slightly higher than men, and people of Asian descent average about two to three percentage points above Black or White individuals. Across all demographic groups, an LVEF below 50% falls outside the expected normal range for healthy people.1PubMed Central. What is a normal left ventricular ejection fraction in healthy adults? A meta-analysis of population-based echocardiographic studies
Most reports express LVEF as a single percentage, but how that number was calculated matters. The standard manual method, called the modified biplane Simpson technique, traces the heart chamber borders in two views to estimate volume. Newer automated tools can also calculate LVEF, though one study found that automated quantification systematically underestimated LVEF by about eight percentage points compared to the manual method, with the gap widening at faster heart rates.2Ultrasound in Medicine & Biology. Underestimation of Ejection Fraction by Automated Quantification Compared to Modified Biplane Simpson Method If your report lists a surprisingly low LVEF, it is worth checking which technique was used. A cardiologist who sees a borderline number will often re-measure manually or order additional imaging before drawing conclusions.
Clinically, LVEF is grouped into broad categories. Above roughly 55% is considered normal. Between about 41% and 55% is mildly reduced. Between 30% and 40% is moderately reduced. Below 30% is severely reduced. These bands guide medication choices and device therapy decisions, so even a few percentage points can shift your treatment plan. That said, LVEF is a somewhat blunt measure. It reflects the overall pumping strength of the left ventricle but can miss subtle dysfunction, which is where some of the other numbers on your report come in.
Chamber Sizes and Wall Thickness
Your report lists dimensions for the four cardiac chambers, usually in centimeters or millimeters. The left ventricle gets the most attention. Two key measurements appear: the internal diameter at end-diastole (when the chamber is full of blood) and at end-systole (when it has just contracted). A normal left ventricular internal diameter at end-diastole in adults generally falls between about 3.9 and 5.3 cm for women and 4.2 and 5.9 cm for men, though the exact cutoffs depend on body size. A dilated left ventricle can signal volume overload from a leaky valve or long-standing high blood pressure.
Wall thickness is measured at two spots: the interventricular septum and the posterior wall. Both are typically between 0.6 and 1.1 cm at rest. Thicker walls suggest the heart muscle has been working harder than it should, often from sustained hypertension or certain inherited conditions. Asymmetric thickening, where the septum is much thicker than the back wall, can point toward hypertrophic cardiomyopathy.
Left ventricular mass is sometimes calculated from these measurements and indexed to body surface area, because a larger person naturally has a larger heart. In healthy adults, men carry significantly more LV mass than women, even after adjusting for body size, and both sex and race influence what counts as normal.3PubMed Central. Normal Values of Left ventricular Mass by Two-Dimensional and Three-Dimensional Echocardiography If your report includes a left ventricular mass index, the reference ranges printed on the page should already account for this, but it is one reason a number flagged “borderline” in a smaller woman might be perfectly fine in a larger man.
Diastolic Function and Filling Pressures
Ejection fraction tells you how well the heart squeezes. Diastolic function tells you how well it relaxes and fills. Many patients with heart failure symptoms actually have a normal LVEF, and their problem shows up here instead. Your report will contain at least two ratios that address this: E/A and E/e’.
The E/A ratio comes from measuring blood flow across the mitral valve during filling. The “E” wave represents early passive filling, and the “A” wave represents the extra push from the atrium contracting. In a young, healthy heart, most filling happens passively, so the E wave is taller than the A wave and the ratio is greater than 1. As the heart stiffens with age or disease, the A wave grows and the ratio drops below 1. In advanced disease, filling pressures can climb so high that the ratio flips back above 1, a “pseudonormal” pattern that requires additional measurements to distinguish from a genuinely healthy heart.
That additional measurement is E/e’. The “e-prime” value is captured by tissue Doppler, which tracks how fast the mitral valve ring itself moves during filling rather than how fast blood flows through it. Dividing the blood-flow E wave by the tissue e’ gives an estimate of left ventricular filling pressure. An E/e’ below about 8 generally suggests normal filling pressure; above roughly 14 suggests elevated pressure; and values in between are indeterminate. Guidelines recommend using these Doppler-based ratios together to assess diastolic dysfunction and estimate filling pressures.4PubMed. A Test in Context: E/A and E/e’ to Assess Diastolic Dysfunction and LV Filling Pressure
Valve Function
A standard echo report evaluates all four heart valves for stenosis (narrowing) and regurgitation (leaking). For each valve, you may see a qualitative grade, a set of Doppler-derived numbers, or both.
Aortic stenosis is the most common valve problem encountered in older adults. The report typically lists a peak velocity across the aortic valve, a mean pressure gradient, and a calculated valve area. A peak velocity under about 2.5 m/s is normal. Between 2.5 and 4 m/s with a mean gradient of 20 to 40 mmHg suggests moderate stenosis. Above 4 m/s or a mean gradient above 40 mmHg pushes into severe territory. Getting accurate velocity readings requires the ultrasound beam to line up precisely with the jet of blood through the valve, which can be challenging in patients with obesity, lung disease, or chest-wall deformities.5PubMed Central. Left Posterior Thoracic Acoustic Window: A Forgotten Approach for Aortic Stenosis Assessment If alignment is off, the report may underestimate severity.6PubMed Central. Echocardiographic assessment of aortic stenosis: a practical guideline from the British Society of Echocardiography
Mitral regurgitation is the most common valve leak. Severity is often reported as trace, mild, moderate, or severe, but these labels can be subjective. Semi-quantitative parameters like vena contracta width and the size of the regurgitant jet on color Doppler are common, though inconsistencies in how they are interpreted across labs are well recognized. A more rigorous approach calculates the actual regurgitant volume and regurgitant fraction, giving a concrete percentage of blood leaking backward with each beat.7PubMed Central. Echocardiographic assessment of mitral regurgitation: discussion of practical and methodologic aspects of severity quantification to improve diagnostic conclusiveness If your report says “moderate mitral regurgitation” but does not include quantitative measurements, it may be worth asking whether a more detailed assessment has been done, especially if surgery or intervention is being considered.
The Right Side of the Heart
Reports also cover the right ventricle, though its complex shape makes it harder to measure precisely with 2D ultrasound. The most commonly reported right-heart measurement is TAPSE, which stands for tricuspid annular plane systolic excursion. It captures how far the right side of the heart’s base moves toward the apex during contraction. A TAPSE of 17 mm or above is typically normal. Below that value, right ventricular systolic function may be impaired. Population-level research has shown that declining TAPSE independently predicts cardiovascular death even after accounting for other heart measurements and clinical risk factors.8PubMed Central. Right Ventricular Function Evaluated by Tricuspid Annular Plane Systolic Excursion Predicts Cardiovascular Death in the General Population
Your report may also estimate pulmonary artery systolic pressure, abbreviated PASP or RVSP. This is derived from the speed of any tricuspid valve leak (tricuspid regurgitation) using a physics equation that converts velocity into pressure. The sonographer measures the peak velocity of that leak jet and adds an estimate of right atrial pressure, often inferred from how much the inferior vena cava collapses when you breathe in.9PubMed Central. Echocardiographic assessment of pulmonary hypertension: a guideline protocol from the British Society of Echocardiography A PASP above about 35 to 40 mmHg raises concern for pulmonary hypertension, though the echo estimate has a margin of error and may need confirmation with a right heart catheterization.
Left Atrial Volume and Aortic Root
Left atrial volume indexed to body surface area is a measurement that does not get as much attention from patients but carries real prognostic weight. A normal indexed volume falls below about 34 mL/m². An enlarged left atrium suggests chronically elevated filling pressures, because the atrium stretches over time when the ventricle is stiff or a valve leaks. Unlike some Doppler measurements that fluctuate with hydration status or heart rate, atrial volume reflects what has been happening over weeks to months, making it a more stable marker of underlying diastolic health.10PubMed. Left atrial volume: a powerful predictor of survival after acute myocardial infarction
The report usually includes aortic root and ascending aorta dimensions as well, measured in centimeters. A dilated aortic root (generally above 4 cm) may warrant monitoring, especially in people with connective tissue conditions or a bicuspid aortic valve. Some clinicians index the aortic measurement to the patient’s height, using a cross-sectional area-to-height ratio; a value above 10 cm²/m has been used as a threshold for increased risk in patients with an already dilated aorta.11PubMed. Aortic Cross-Sectional Area/Height Ratio and Outcomes in Patients With a Trileaflet Aortic Valve and a Dilated Aorta
Regional Wall Motion
In addition to the overall ejection fraction, the report describes how individual segments of the left ventricle are moving. The standard model divides the ventricle into 17 segments, and each is scored on a scale: normal motion gets a 1, reduced motion (hypokinesis) a 2, absent motion (akinesis) a 3, and paradoxical outward motion (dyskinesis) a 4. These scores are averaged into a Wall Motion Score Index, or WMSI, where a perfect score is 1.0.12PubMed Central. Imaging Pattern and Prognostic Impact of Regional Wall Motion Abnormalities in 255 697 Men and 236 641 Women Investigated with Echocardiography
The location of a wall motion abnormality is just as important as its severity. Each segment corresponds to a specific coronary artery territory. If segments supplied by the left anterior descending artery show akinesis while the rest of the heart contracts normally, that pattern is consistent with a prior heart attack in that artery’s distribution. Your cardiologist reads these findings like a map, identifying which vessel was likely affected and whether the damage is old scar or new injury. A report that says “anteroseptal hypokinesis” is pointing to a specific region and a specific concern, not just a generalized problem.
Pericardial Effusion
The pericardium is the thin sac surrounding the heart. Normally there is a sliver of fluid between the sac and the heart muscle, but an echo can detect when excess fluid has collected. Reports typically grade pericardial effusions by the size of the echo-free space measured behind the heart: a small effusion is roughly under 1 cm, moderate is 1 to 2 cm, and large is above 2 cm.
Size alone does not determine how dangerous an effusion is. A slowly accumulating effusion can grow quite large before causing trouble, because the pericardium has time to stretch. A rapidly accumulating effusion, even a relatively small one, can compress the heart chambers and impair filling, a condition called tamponade. The echo looks for specific signs of tamponade: collapse of the right atrium or right ventricle during certain phases of the cardiac cycle, exaggerated swings in blood flow across the mitral and tricuspid valves with breathing, and a plump inferior vena cava that does not collapse on inspiration.13PubMed Central. Echocardiographic Evaluation of Pericardial Effusion and Cardiac Tamponade14PubMed Central. Diagnosis and management of pericardial effusion If your report mentions a pericardial effusion with “no echocardiographic evidence of tamponade,” that is the reassuring part of the sentence.
Global Longitudinal Strain
Not every report includes this, but it is increasingly common, especially if you are being monitored during cancer treatment or have subtle heart failure symptoms with a normal LVEF. Global longitudinal strain, or GLS, measures how much the heart muscle fibers shorten during contraction by tracking tiny speckle patterns in the ultrasound image frame to frame. It is reported as a negative percentage; more negative means stronger contraction. A normal GLS generally falls around –18% to –22%.
GLS is considered a more sensitive detector of early heart dysfunction than LVEF. In patients receiving chemotherapy drugs known to damage the heart, GLS can drop before the ejection fraction falls, allowing earlier intervention. It has also shown value in conditions like heart failure with preserved ejection fraction, aortic stenosis, and atrial fibrillation, where traditional measures may look deceptively normal.15PubMed. Clinical Utility of Echocardiographic Strain and Strain Rate Measurements16PubMed Central. Left Ventricular Global Longitudinal Strain (GLS) Is a Superior Predictor of All-Cause and Cardiovascular Mortality When Compared to Ejection Fraction in Advanced Chronic Kidney Disease If your report includes a GLS value that seems “abnormal” but your LVEF is fine, that discrepancy is worth a conversation with your cardiologist.
Why the Same Heart Can Give Different Numbers
One frustrating reality of echo reports is that repeating the same test can produce somewhat different results. Ejection fraction measured by 2D echocardiography has a recognized margin of variability. Compared to cardiac MRI, which is considered the gold standard for measuring LVEF, 2D echo shows a systematic underestimation averaging roughly four percentage points, with individual measurements varying by as much as fifteen points in either direction. In cancer patients being monitored for heart damage, this variability led to misclassification of about one in ten patients at a clinically important threshold.17Radiological Society of North America. Echocardiography versus Cardiac MRI for Measurement of Left Ventricular Ejection Fraction in Individuals with Cancer and Suspected Cardiotoxicity
Image quality plays a large role. Patients with obesity, severe lung disease, chest-wall deformities, or surgical scars can have poor acoustic windows, meaning the ultrasound beam has trouble reaching the heart clearly.5PubMed Central. Left Posterior Thoracic Acoustic Window: A Forgotten Approach for Aortic Stenosis Assessment When image quality is limited, border tracing becomes more subjective and measurements carry wider uncertainty. Most reports include a comment on image quality; if yours says “suboptimal” or “limited windows,” treat the specific numbers with a bit more flexibility.
Heart rate, blood pressure, hydration, and even caffeine intake before the test can shift some values, especially Doppler-based measurements of diastolic function and valve gradients. A single echo report is a snapshot. Trends across multiple studies, rather than any single set of numbers, are what your cardiologist relies on to make major decisions.
Pediatric Reports and Z-Scores
If you are reading an echo report for a child, you will encounter Z-scores rather than fixed adult reference ranges. A Z-score expresses how far a measurement falls from the average for children of the same body size. A Z-score of 0 means exactly average. A Z-score of +2 means the measurement is two standard deviations above the mean, and –2 means two below. This system exists because a heart chamber that would be tiny in an adult might be perfectly proportional in a toddler.18PubMed Central. The use of Z-scores in paediatric cardiology
Z-scores are typically derived from the child’s body surface area, but age, sex, race, and ethnicity can all influence the reference values.19PubMed Central. Relationship of Echocardiographic Z Scores Adjusted for Body Surface Area to Age, Sex, Race, and Ethnicity A Z-score between –2 and +2 is generally considered within normal limits for most structures. Values outside that range warrant closer attention, though the clinical significance depends on which structure is measured and the child’s overall picture. If your child’s report shows a Z-score of +2.5 for the aortic root, for instance, the pediatric cardiologist will weigh that against family history, the child’s connective-tissue health, and whether the value is stable over time.
Stress Echo Versus Resting Echo
A standard 2D echo is performed at rest. A stress echo adds a provocation, either exercise on a treadmill or a medication that simulates exercise, and then images the heart again to see how it responds. The stress component is specifically looking for wall motion abnormalities that appear only when the heart is working hard, which is the hallmark of a coronary artery that is narrowed enough to limit blood flow under demand but adequate at rest.
Exercise and dobutamine (a medication that speeds up and strengthens the heartbeat) show similar sensitivity for detecting coronary artery disease, both in the range of roughly 72% to 76%, while a vasodilator agent like dipyridamole is somewhat less sensitive at about 52%. All three approaches have high specificity, above 94%, meaning that a normal stress echo result is quite reliable.20Journal of the American College of Cardiology. Stress echocardiography: Comparison of exercise, dipyridamole and dobutamine in detecting and predicting the extent of coronary artery disease The choice of stress method depends on whether you can exercise adequately and on your specific clinical question. If your stress echo report mentions “new wall motion abnormality in the inferior wall at peak stress,” that is a finding your cardiologist will act on, often with additional testing or a catheterization.