Left Atrial Volume Index (LAVI)
Left-atrial volume index by the biplane area-length method with the ASE severity bands (Lang 2015).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Apical 4-chamber LA area
- 21 cm^2
- Apical 2-chamber LA area
- 21 cm^2
- LA length
- 5.0 cm
- Body surface area
- 2.0 m^2
Result: LA volume 75 mL; LAVI 37.5 mL/m² — mildly enlarged.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Bands
- mL/m²: normal ≤ 34, mild 35–41, moderate 42–48, severe > 48.
What you enter
- Apical 4-chamber LA area
- Apical 2-chamber LA area
- LA length (shorter of the two)
- Body surface area
How this is calculated
- Formula
- Biplane area-length: LA volume = 0.85·(A1·A2)/L (A1 = A4C area, A2 = A2C area, L = shorter LA length); LAVI = volume/BSA.
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;28(1):1-39. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.