Echocardiogram Results Explained: What Cardiologists Measure and What Each Number Means

An echocardiogram (often called an "echo") is an ultrasound of your heart. It's a safe, painless test that uses sound waves to create moving images of your heart chambers, valves, walls and blood vessels. When you receive your echocardiogram results, you'll see a variety of measurements and terms that may look intimidating. This guide breaks down the most common numbers cardiologists report, what they mean and when to follow up with a healthcare professional.

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1. Ejection Fraction (EF)

What it is:
Ejection fraction measures how much blood the left ventricle pumps out with each heartbeat as a percentage of the total amount of blood it holds.

• Normal range: 55–70%
• Borderline/"mildly reduced": 45–54%
• Reduced: <45%

Why it matters:
A lower EF can signal heart failure, cardiomyopathy or damage from a prior heart attack. An EF above 70% may reflect hyperdynamic function, sometimes seen in anemia or high blood pressure.

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2. Chamber Sizes and Volumes

Left Ventricle (LV)

• End‐Diastolic Diameter (LVEDD): size of the LV at rest
  • Normal: 3.8–5.7 cm in men, 3.5–5.2 cm in women
• End‐Systolic Diameter (LVESD): size of the LV at contraction
  • Normal: <4.0 cm

Left Atrium (LA)

• LA Volume Index: volume of the left atrium adjusted for body surface area
  • Normal: ≤34 mL/m²
  • Enlarged: >34 mL/m²

Right Ventricle (RV)

• RV Basal Diameter: width of the RV at its base
  • Normal: ≤4.2 cm
• RV Function (TAPSE): tricuspid annular plane systolic excursion
  • Normal: ≥17 mm

Why it matters:
Enlargement can indicate high blood pressure, valve disease or chronic lung problems. Reduced RV function may suggest pulmonary hypertension or right-sided heart failure.

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3. Wall Thickness and Motion

Interventricular Septum & LV Posterior Wall

• Normal Thickness: 0.6–1.1 cm
• Hypertrophy: >1.1 cm

Regional Wall Motion

• Described as:
  • Normal
  • Hypokinesis (reduced movement)
  • Akinesis (no movement)
  • Dyskinesis (abnormal outward bulge)

Why it matters:
Thickened walls (hypertrophy) often reflect high blood pressure or valve stenosis. Abnormal wall motion can signal prior heart attack or ongoing ischemia (reduced blood flow).

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4. Valve Function

Echocardiograms evaluate each valve for structure, opening and closing, and blood flow patterns.

Key Measurements

• Peak Velocity (m/s): speed of blood through a valve
• Mean/Max Gradient (mm Hg): pressure difference across a valve
• Regurgitation Severity: graded as trace, mild, moderate or severe

Normal Findings

• Aortic Valve peak velocity: 1.0–1.7 m/s
• Mitral inflow E/A ratio: 1.0–1.5 in younger adults

Abnormal Findings

• Aortic stenosis: peak velocity >2.6 m/s, mean gradient >20 mm Hg
• Mitral regurgitation: moderate or severe regurgitant fraction >30%

Why it matters:
Valvular stenosis (narrowing) or regurgitation (leakage) can strain your heart, lead to symptoms like shortness of breath or chest pain, and may require medical or surgical treatment.

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5. Diastolic Function

Diastolic function describes how well the heart relaxes and fills with blood.

Common Parameters

• E/A Ratio: early (E) to late (A) ventricular filling velocities
  • Normal in adults: 1.0–2.0
• E/e′ Ratio: estimate of left atrial pressure
  • Normal: <8
  • Elevated: >14

Why it matters:
Abnormal diastolic function can cause symptoms of heart failure even if the EF is preserved. It's common in high blood pressure, diabetes and aging.

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6. Pulmonary Artery Pressure

Estimated by measuring the velocity of tricuspid regurgitation flow:

• Normal Pulmonary Artery Systolic Pressure (PASP): ≤35 mm Hg
• Mild Pulmonary Hypertension: 36–45 mm Hg
• Moderate–Severe: >45 mm Hg

Why it matters:
Elevated pressures can indicate pulmonary hypertension, chronic lung disease or left‐sided heart problems.

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7. Pericardial Effusion

Echocardiograms can detect fluid around the heart:

• Small Effusion: <10 mm
• Moderate: 10–20 mm
• Large: >20 mm

Why it matters:
Small effusions may simply be monitored. Moderate to large effusions can impair heart function (tamponade) and require urgent treatment.

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Putting It All Together

When you review your echocardiogram results, focus on:

1. Overall Heart Function
   • Ejection fraction, chamber sizes, wall motion
2. Valve Health
   • Gradients, regurgitation severity
3. Pressure Estimates
   • Diastolic function, pulmonary pressures
4. Structural Findings
   • Hypertrophy, effusion, congenital abnormalities

Even a single abnormal value doesn't always indicate a serious problem. Cardiologists interpret results in the context of your age, symptoms and medical history.

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Next Steps and When to Seek Help

• Discuss any abnormal findings with your cardiologist.
• If you experience chest pain, fainting, severe shortness of breath or swelling in your legs, seek medical attention right away.
• For questions about your symptoms before your appointment, try using a Medically approved LLM Symptom Checker Chat Bot to help understand what you're experiencing.

Always speak to a doctor about anything that could be life threatening or serious. Your healthcare provider can explain your results in detail and recommend treatment or monitoring tailored to you.

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Bottom Line: An echocardiogram provides a wealth of information about your heart's structure and function. Understanding each measurement helps you have informed conversations with your cardiologist and take charge of your heart health.