Canonical: https://echosuite.app/guides/lvot-flow/

# LVOT stroke volume and cardiac output calculator

Connect LVOT measurements to stroke volume, stroke volume index, cardiac output and cardiac index in the interactive tool.

Created by [Mohammed Kamareddine, MD](https://echosuite.app/about/) · [Sources & educational scope](https://echosuite.app/about/)

[Open interactive calculator →](https://echosuite.app/calculators/#lvot-flow)

## Method

SV = π × (diameter ÷ 2)² × VTI; CO = SV × HR ÷ 1000; SVi = SV ÷ BSA; CI = CO ÷ BSA

Use the measurement units shown below. Some fields apply only to a selected method or condition; follow the interactive tool’s method choices. The interactive tool keeps missing measurements incomplete and provides its method-specific results and reference context.

## Measurements and acquisition

### LVOT diameter  cm

Enter the measured value in the displayed unit

- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.

### LVOT PW VTI  cm

Enter the measured value in the displayed unit

- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.

### Heart rate at acquisition  bpm

Enter the measured value in the displayed unit · Optional

- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.

### Body surface area  m²

Enter the measured value in the displayed unit · Optional

- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.

## Sources and method context

ASE · 2019 · Comprehensive Transthoracic Echocardiographic Examination in Adults · LVOT PW Doppler and paired diameter acquisition; Doppler volumetric flow

[Primary reference](https://www.asecho.org/wp-content/uploads/2025/04/2019_Comprehensive-TTE.pdf)

- Acquisition and interpretation · LVOT PW Doppler and paired diameter acquisition; Doppler volumetric flow

Method-specific acquisition and reference context. Arithmetic uses entered measurements; clinical interpretation remains subject to image quality and study context.

Catalogue review status: Exact guideline locator mapped · clinical sign-off pending

These pages describe the educational tool. Interpret measurements with the complete clinical context and the method’s acquisition limitations.

## Keep exploring

- [Parasternal long axis acquisition guide](https://echosuite.app/guides/views/plax/) · [Open in Probe Lab](https://echosuite.app/#plax)
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- [Apical three chamber (apical long axis) acquisition guide](https://echosuite.app/guides/views/apical-three-chamber/) · [Open in Probe Lab](https://echosuite.app/#a3c)
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- [Left ventricular dimensions calculator and measurement guide](https://echosuite.app/guides/lv-linear/)
- [Left ventricular mass and wall thickness calculator](https://echosuite.app/guides/lv-mass/)
- [Left ventricular volume index calculator: EDV and ESV](https://echosuite.app/guides/lv-volume-index/)
- [Aortic stenosis: from echo views to the continuity equation](https://echosuite.app/learn/aortic-stenosis-continuity/)

[All echo guides](https://echosuite.app/guides/) · [Learning paths](https://echosuite.app/learn/)