Aortic Valve Area (AVA) Calculator

Your details

Choose the method that matches your data source. The Continuity Equation uses Doppler echo measurements. The Gorlin and Hakki equations use hemodynamic (catheterization) data.
Left ventricular outflow tract diameter measured by 2D echocardiography, typically in the parasternal long-axis view just below the aortic valve.
cm
Velocity-time integral of the LVOT measured by pulsed-wave Doppler, tracing the systolic flow envelope.
cm
Velocity-time integral through the aortic valve measured by continuous-wave Doppler, tracing the peak systolic envelope.
cm
Aortic Valve AreaSevere stenosis
0.86cm²

Effective aortic valve orifice area

LVOT Cross-sectional Area3.14cm²
AVA / indexed noteSevere stenosis (AVA <= 1.0 cm2)
0.86 cm²
Severe<1Moderate1-1.5Mild / Normal1.5-3Normal3+

AVA 0.86 cm2 - Severe aortic stenosis.

  • The Continuity Equation yields an AVA of 0.86 cm2, consistent with severe aortic stenosis.
  • An AVA below 1.0 cm2 meets the hemodynamic threshold for severe stenosis. Symptomatic severe AS or asymptomatic severe AS with LV dysfunction generally warrants valve replacement.
  • AVA should always be interpreted alongside mean gradient, peak jet velocity, and symptoms, as low-flow states can underestimate true gradient.

Next stepFor borderline or low-flow results, consider indexing AVA to body surface area (severe if AVA index < 0.6 cm2/m2) and correlating with clinical symptoms and additional imaging.

 = Powered by OnlyCalculators