Right ventricular function calculator: TAPSE, FAC and coupling
Explore the RV function and coupling measurements available in the tool, with acquisition teaching and method-specific references.
Method
FAC or EF = (end-diastolic − end-systolic) ÷ end-diastolic × 100; coupling = TAPSE ÷ PASP
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
Measurement
Enter the measured value in the displayed unit
- TAPSE
- S′
- FAC
- Free-wall strain
- 3D RVEF
- TAPSE/PASP
- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.
TAPSE mm
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.
Lateral tricuspid S′ cm/s
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.
End-diastolic area cm²
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.
End-systolic area cm²
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.
Free-wall strain · magnitude %
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.
3D end-diastolic volume mL
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.
3D end-systolic volume mL
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.
Estimated PASP mmHg
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.
PASP acquisition
Enter the measured value in the displayed unit
- Reliable
- Unreliable / uncertain
- 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 · 2025 · Echocardiographic Assessment of the Right Heart in Adults · Table 1; RV size pp.143–151; function pp.156–160; TAPSE/PASP pp.156–157
- Acquisition and interpretation · Table 1; RV size pp.143–151; function pp.156–160; TAPSE/PASP pp.156–157
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
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