Adult Echocardiography Normal Values: A Reporting Bench Card

You have scanned the patient yourself, there is no reporting cardiologist on site, and the referring surgeon wants an answer before the list starts. The question is rarely “what is normal” in the abstract. It is whether this particular number, measured on this particular study, should change what happens to the patient today. This reference groups adult transthoracic values around that question, with the measurement traps that most often corrupt an otherwise competent study, and it assumes you are the one holding the probe as well as writing the report.

Before you measure anything

Two habits determine whether the rest of the study means anything. Index chamber dimensions and volumes to body surface area, because an unindexed left atrial diameter is close to uninterpretable at either extreme of body size. And apply sex-specific ranges, since using male thresholds in women systematically under-diagnoses chamber enlargement. Both are trivial to do and both are commonly skipped when the department is busy.

The decision points

1. Decide whether the study is good enough to answer the question asked

Apical foreshortening is the commonest and most expensive error in adult echocardiography. It shrinks volumes and inflates ejection fraction, occasionally by enough to move a patient across a device eligibility threshold. Move the patient rather than the probe to find the true apex. If the endocardium is not seen across two contiguous segments, say so in the report and consider contrast rather than reporting a number you do not believe.

2. Establish left ventricular size and systolic function on volumes, not linear dimensions

Linear measurements remain useful for serial comparison in the same patient, but biplane volumetric assessment is what should drive decisions about valve intervention and device eligibility. Reference ranges for the adult left ventricle sit in the bench card below. Inter-observer variability for ejection fraction is of the order of five to ten percentage points, so a report stating an ejection fraction to one decimal place claims a precision the technique does not possess. Report a category or a range when image quality is imperfect.

3. Ask whether “normal ejection fraction” is actually normal

Global longitudinal strain detects impairment while ejection fraction remains untouched, and it has become the deciding measurement in cardiotoxicity surveillance, infiltrative disease and early hypertensive heart disease. Values more negative than minus twenty per cent are conventionally normal, with a healthy band roughly between minus sixteen and minus twenty-two per cent depending on vendor and software version. That vendor dependence is clinically important: serial comparisons must be made on the same platform, and the report should name the system used. Pattern recognition in strain mapping is developed further in the echocardiography atlas for clinicians.

4. Use the left atrium as your barometer of chronic filling pressure

Left atrial volume index is the single most informative atrial measurement and an independent predictor of atrial fibrillation, stroke and mortality. Linear atrial diameter survives in reports out of habit and should not drive interpretation. Left atrial reservoir strain has now entered mainstream diastolic assessment, with values at or below eighteen per cent supporting elevated left atrial pressure; it is less load-dependent than the ratio of early filling velocity to annular velocity and performs well when that ratio is equivocal.

5. Report at least two right ventricular indices

The right ventricle is geometrically uncooperative and no single number suffices. Longitudinal indices such as annular plane systolic excursion and tissue Doppler systolic velocity interrogate the base only, and they fall after cardiac surgery even when global right ventricular performance is preserved. Pair a longitudinal index with fractional area change or free wall strain. Estimate right atrial pressure from inferior caval diameter and its inspiratory collapse, then add it to the peak tricuspid regurgitant gradient for a systolic pulmonary artery pressure. Recent right heart guidance grades these parameters across four tiers rather than as simply normal or abnormal, which matters when you are tracking a patient with pulmonary hypertension over time.

6. Grade diastolic function on the primary variables, then adjudicate

Current practice evaluates annular early diastolic velocity, the ratio of early filling to annular velocity, and tricuspid regurgitant velocity together rather than through a stepwise cascade with separate entry points for preserved and reduced ejection fraction. When the primaries disagree or are unobtainable, supporting measures carry the decision: left atrial reservoir strain, pulmonary venous systolic to diastolic ratio, left atrial volume index and isovolumic relaxation time. Grade one shows impaired relaxation with normal filling pressure, grade two shows two or more abnormal primaries with intermediate filling pressures, and grade three shows all three abnormal with markedly elevated pressures, subdivided by whether the pattern reverses with Valsalva. Irreversibility carries the worse prognosis.

7. Apply valve thresholds, then look for the situations that defeat them

Low-flow, low-gradient aortic stenosis is the recurring trap. When the calculated valve area is in the severe range but the mean gradient is not, measure stroke volume index; a value below 35 mL/m squared should prompt dobutamine stress echocardiography or calcium scoring rather than a reflex report of moderate disease. Doppler angle above roughly twenty degrees materially underestimates velocity, so interrogate aortic stenosis from multiple windows, including right parasternal, before concluding that gradients are modest. Structured practice in these decisions is the focus of our echocardiography masterclass.

When to escalate, transfer or call for help

• Same day: new severe left ventricular impairment with clinical decompensation, a large pericardial effusion with respiratory variation and chamber collapse, suspected endocarditis with a mobile mass, or a mechanical complication after infarction.
• Urgent referral: severe aortic stenosis with any symptom, severe primary mitral regurgitation, or newly severe tricuspid regurgitation with right ventricular dilatation. Landmark data from the PARTNER programme in aortic stenosis and COAPT in secondary mitral regurgitation have moved these thresholds well below what many general clinics still assume.
• Refer for a second study rather than a decision: discordant valve grading, unexplained pulmonary hypertension, or a strain result that conflicts with a visually normal ventricle. Transoesophageal or cross-sectional imaging usually resolves it, and the diagnosis and imaging reference hub sets out when each modality adds value.
• Flag for heart failure follow-up: elevated filling pressures with preserved ejection fraction. These patients are frequently discharged as normal studies, and the heart failure, rhythm and risk hub is the natural next stop.

What to document

• The method used for each headline measurement, particularly for ejection fraction.
• Indexation to body surface area, with height and weight recorded.
• The vendor and software platform when strain is reported, so that serial studies remain comparable.
• An explicit statement of image quality and which segments were not adequately visualised.
• Whether measurements in atrial fibrillation were averaged across at least five cycles or obtained by the index-beat method.
• A one-line interpretive conclusion that answers the referral question rather than restating the numbers.

Bench card

Severity thresholds worth keeping to hand: aortic stenosis is severe at a peak velocity of 4.0 m/s, a mean gradient of 40 mmHg or a valve area of 1.0 cm2; mitral stenosis at a valve area of 1.5 cm2; mitral regurgitation at an effective orifice of 0.40 cm2 or a regurgitant volume of 60 mL. The full set, with acquisition protocols, sits in the practical echocardiography reference and across the echocardiography collection. A companion chart version of these values is published as an adult echocardiography normal values chart.

Questions from the floor

How should chamber size be indexed in severe obesity?

Body surface area indexing under-detects enlargement at high body weight because the denominator scales with the excess mass. Height-based allometric indexing performs better and is worth adopting where your software supports it. At minimum, state which method was used.

Can I report diastolic function in atrial fibrillation?

Partially. Annular velocities, the ratio to early filling velocity and tricuspid regurgitant velocity remain usable if averaged across enough cycles, but the E to A ratio and atrial volume lose their meaning. Report what is interpretable and name what is not.

Does a normal ejection fraction exclude significant disease?

No, and this is the most consequential limitation in routine practice. Amyloid, early cardiotoxicity, aortic stenosis with a small hypertrophied ventricle and heart failure with preserved ejection fraction all present with an ejection fraction inside the reference range. Strain and filling pressure assessment are what separate them.

My laboratory has an older machine. Are these ranges still applicable?

Chamber and Doppler ranges are broadly robust across platforms. Strain is not, and older systems may not support it at all. Where strain is unavailable, lean harder on atrial size, filling pressure indices and careful serial comparison rather than treating ejection fraction as sufficient.

Reviewed by Dr A M Thirugnanam, MD, MSICP, FSCAI, Ph.D., Senior Interventional Cardiologist — compiled for physicians who acquire, measure and report their own studies without a second reader.