LA Volume Index Threshold Calculator

Calculate left atrial volume index (LAVI) from biplane method. LAVI > 34 mL/m² indicates LA enlargement and chronic elevated filling pressures.

Body surface area input

Left atrial volume (mL)

Height (cm)

Weight (kg)

33.0mL/m²

Normal left atrial volume index (< 34 mL/m²)

Left atrial volume60 mLEchocardiographic volume

Body surface area1.82 m²Mosteller formula

Category	LAVI (mL/m²)
Normal	< 34
Elevated	≥ 34

Clinical Guidance

The left atrial volume index normalises the left atrial volume to body size, allowing comparison across patients of different stature. It is a key marker of diastolic dysfunction and a predictor of adverse cardiovascular outcomes. Per the ASE 2015 chamber quantification guideline, a normal LAVI is < 34 mL/m²; values ≥ 34 mL/m² are considered enlarged.

Body surface area is computed with the Mosteller formula (√(height × weight / 3600)) when height and weight are supplied, or may be entered directly. This is a decision aid, not a diagnosis — interpret alongside the full echocardiographic and clinical picture.

How It Works

Calculate left atrial volume index (LAVI) from biplane method. LAVI > 34 mL/m² indicates LA enlargement and chronic elevated filling pressures

Each component has a specific meaning:

Biplane method — The biplane method recorded for the scenario being assessed.

Note: Interpret the la volume index result against the thresholds and context described above.

How to Use

Enter the biplane method for the scenario you are assessing. Calculate left atrial volume index (LAVI) from biplane method. LAVI > 34 mL/m² indicates LA enlargement and chronic elevated filling pressures. Use the la volume index result to inform your calculation.

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Frequently Asked Questions