Normal Echocardiogram Values
Updated for the 2025 ASE diastolic function and right heart guidelines. Chamber dimensions, volumes, ejection fraction, strain, right ventricular indices and filling pressures — with the cutoffs that actually change management.
Every echocardiographer eventually memorises a handful of numbers and then discovers, usually mid-report, that the rest live scattered across several guideline documents and a decade of revisions. This reference brings the adult transthoracic values together in one place, drawn from the ASE/EACVI chamber quantification recommendations and — importantly — from two substantial 2025 updates from the American Society of Echocardiography: a rewritten diastolic function guideline that supersedes the 2016 algorithm most online reference charts still reproduce, and a new right heart guideline that replaces binary normal/abnormal cutoffs with graded severity.
Two principles are worth restating before the tables. First, almost every linear and volumetric measurement should be indexed to body surface area; an unindexed left atrial diameter is close to meaningless in a 150 cm patient and equally so in a 100 kg one. Second, reference ranges are sex-specific for most chamber measurements, and applying male cutoffs to female patients systematically under-diagnoses remodelling — a recurring source of missed early cardiomyopathy.
Left Ventricular Size and Systolic Function
Linear dimensions remain useful for serial follow-up, but volumetric assessment by the biplane method of discs is what should drive clinical decisions, particularly around valve intervention thresholds and device eligibility.
| Parameter | Men | Women |
|---|---|---|
| LV end-diastolic diameter | 42–58 mm | 38–52 mm |
| LV end-diastolic volume index | 34–74 mL/m² | 29–61 mL/m² |
| LV end-systolic volume index | 11–31 mL/m² | 8–24 mL/m² |
| Ejection fraction (biplane Simpson’s) | 52–72% | 54–74% |
| Septal / posterior wall thickness | ≤10 mm | ≤9 mm |
| LV mass index | ≤115 g/m² | ≤95 g/m² |
| Relative wall thickness | ≤0.42 (both sexes) | |
Global longitudinal strain
GLS has moved from research tool to routine reporting, and for good reason: it detects subclinical dysfunction while ejection fraction remains stubbornly normal. Normal GLS is more negative than −20%, with a reported healthy range of roughly −16% to −22% depending on vendor and software version. That vendor dependence matters clinically — serial strain comparisons should be made on the same platform, and a change of more than about 2 percentage points is generally required before calling it real. In cardio-oncology surveillance, a relative reduction greater than 15% from baseline is the accepted threshold for cancer therapy–related cardiac dysfunction, and typically precedes any fall in EF by months.
Normal Echocardiogram Values:
Left and Right Atrium
Left atrial volume index is the single most useful atrial measurement — a barometer of chronically elevated filling pressures, and an independent predictor of atrial fibrillation, stroke and mortality. Linear LA diameter from the parasternal window persists in reports out of habit; it should not drive interpretation.
| Parameter | Normal | Comment |
|---|---|---|
| LA volume index | 16–34 mL/m² | >34 mL/m² = enlarged; mild/moderate/severe at 35–41, 42–48, >48 |
| LA reservoir strain | >18% | ≤18% supports elevated LA pressure (2025 ASE) |
| RA area (4-chamber) | <19 cm² | Simple, reproducible screen (2025 ASE) |
| RA volume index (method of discs) | <30 mL/m² | Now the preferred measure over area |
Right Ventricle
The right ventricle is geometrically uncooperative, so no single number suffices. Report at least two indices, and be explicit when image quality limits them. TAPSE and tissue Doppler S′ interrogate the longitudinal base only and can mislead after cardiac surgery, where longitudinal function falls while global RV performance is preserved.
The 2025 ASE right heart guideline, written with a particular focus on pulmonary hypertension, makes a structural change worth noting: these parameters now carry four-tier severity grading — normal, mild, moderate and severe — rather than a single abnormal cutoff. The normal thresholds below are unchanged, but a TAPSE of 12 mm and one of 16 mm are no longer reported identically as simply “reduced.”
| Parameter | Normal |
|---|---|
| RV basal diameter (4-chamber) | <41 mm |
| RV mid-cavity diameter | ≤35 mm |
| TAPSE | ≥17 mm |
| RV S′ (tissue Doppler) | >9.5 cm/s |
| Fractional area change | >35% |
| RV free wall longitudinal strain | More negative than −20% |
| RV outflow tract, parasternal proximal | ≤35 mm |
Right atrial pressure and pulmonary pressures
Estimate RA pressure from the inferior vena cava: diameter ≤21 mm with more than 50% inspiratory collapse corresponds to approximately 3 mmHg; >21 mm with less than 50% collapse to approximately 15 mmHg; intermediate findings to 8 mmHg. Systolic pulmonary artery pressure is then the peak TR gradient plus estimated RA pressure, and a peak TR velocity ≥2.8 m/s is the threshold now embedded in the diastolic algorithm. In ventilated patients and in athletes with dilated compliant IVCs, this estimate degrades badly — say so in the report rather than reporting a falsely precise number.
Diastolic Function: What Changed in the 2025 ASE Guideline
This is the section most reference charts have not yet caught up with. In July 2025 the ASE published a revised guideline, chaired by Sherif Nagueh, that replaces the 2016 ASE/EACVI document. The change is not cosmetic. Rather than the previous stepwise cascade with its separate entry points for normal and reduced ejection fraction, the 2025 algorithm evaluates three primary variables simultaneously, adds supplementary parameters when the primary trio is equivocal, and provides dedicated pathways for atrial fibrillation, pulmonary hypertension, mitral annular calcification and transplant recipients — precisely the populations in which the old algorithm most often failed.
The three primary variables
| Variable | Abnormal cutoff | What it reflects |
|---|---|---|
| e′ velocity | Septal ≤6 cm/s, lateral ≤7 cm/s, or average ≤6.5 cm/s | Impaired myocardial relaxation |
| E/e′ ratio | Septal ≥15, lateral ≥13, or average ≥14 | Elevated LV filling pressure |
| TR velocity / PASP | ≥2.8 m/s, or PASP ≥35 mmHg | Downstream pressure transmission |
Supplementary parameters
When the primary variables disagree or are technically unobtainable, four supporting measures carry weight: LA reservoir strain ≤18%, pulmonary vein S/D ratio ≤0.67, LA volume index >34 mL/m², and IVRT ≤70 ms. The formal elevation of LA strain into the algorithm is arguably the most consequential change for daily practice — it is load-sensitive in a way that complements E/e′, and it performs particularly well when annular velocities are unreliable.
Grading
| Grade | Findings | Filling pressure |
|---|---|---|
| Normal | All three primary variables normal | Normal |
| Grade 1 — impaired relaxation | Reduced e′ only; E/A ≤0.8 | Normal |
| Grade 2 — pseudonormal | ≥2 of 3 primary variables abnormal; E/A 0.8–2.0 | Mildly to moderately elevated |
| Grade 3 — restrictive | All three abnormal; E/A ≥2.0 | Markedly elevated |
Grade 3 is now subdivided by Valsalva response: grade 3a where the filling pattern reverses with the manoeuvre, and grade 3b where it remains fixed — a distinction with prognostic weight, since irreversibility tracks with worse outcomes. The guideline also carries a dedicated section on the echocardiographic contribution to diagnosing heart failure with preserved ejection fraction, reflecting the reality that HFpEF diagnosis is where diastolic assessment now earns its keep.
Valve Assessment: Severity Thresholds Worth Memorising
| Lesion | Severe when |
|---|---|
| Aortic stenosis | Peak velocity ≥4.0 m/s; mean gradient ≥40 mmHg; AVA ≤1.0 cm² (≤0.6 cm²/m² indexed) |
| Mitral stenosis | MVA ≤1.5 cm² (very severe ≤1.0 cm²) |
| Mitral regurgitation | EROA ≥0.40 cm²; regurgitant volume ≥60 mL; vena contracta ≥0.7 cm |
| Aortic regurgitation | EROA ≥0.30 cm²; regurgitant volume ≥60 mL; vena contracta >0.6 cm |
| Tricuspid regurgitation | EROA ≥0.40 cm²; vena contracta >0.7 cm |
Low-flow, low-gradient aortic stenosis remains the trap. When the calculated valve area is severe but the mean gradient is not, stroke volume index below 35 mL/m² should prompt dobutamine stress echocardiography or calcium scoring rather than a reflexive report of moderate disease.
Five Pitfalls That Corrupt Otherwise Good Measurements
Apical foreshortening is the commonest and most consequential error, systematically underestimating volumes and inflating ejection fraction — often by enough to move a patient across a device eligibility threshold. Obtain the true apex, even if it means moving the patient rather than the probe.
Angle of insonation above roughly 20 degrees materially underestimates Doppler velocities. In aortic stenosis this means interrogating from multiple windows, including right parasternal and suprasternal, before concluding gradients are modest.
Indexing in obesity is genuinely unresolved. Body surface area indexing under-detects chamber enlargement in severe obesity because BSA scales with the excess weight; height-based allometric indexing performs better and is worth adopting where available.
Single-beat measurement in atrial fibrillation introduces large error. Average across at least five consecutive cycles, or use the index-beat approach where two preceding RR intervals are approximately equal.
Reporting precision you do not possess. An ejection fraction of “58.4%” implies a reproducibility echocardiography does not have; inter-observer variability for EF is on the order of 5 to 10 percentage points. Report ranges or categories when image quality is suboptimal, and state the limitation explicitly.
Take these values with you
These tables are condensed from the full reference set in Echocardiography Quick Notes, a practical bench-side guide covering acquisition protocols, measurement technique, complete normal ranges and worked reporting examples — written for residents, fellows and physicians who perform their own studies.
If you would rather learn the technique hands-on, our Basic Echocardiography course covers systematic acquisition, measurement and reporting with live scanning practice.
References
Lang RM, Badano LP, Mor-Avi V, et al. Recommendations for cardiac chamber quantification by echocardiography in adults: an update from the American Society of Echocardiography and the European Association of Cardiovascular Imaging. J Am Soc Echocardiogr. 2015.
Nagueh SF, et al. Recommendations for the evaluation of left ventricular diastolic function by echocardiography and for heart failure with preserved ejection fraction diagnosis: an update from the American Society of Echocardiography. J Am Soc Echocardiogr. 2025.
American Society of Echocardiography. 2025 ASE guidelines on echocardiographic evaluation of the right heart with focus on pulmonary hypertension. 2025.
Reference values apply to adults and assume adequate image quality. Individual laboratories should validate ranges against their own equipment and population. This article is intended for qualified healthcare professionals and does not substitute for clinical judgement.
