Canonical: https://echosuite.app/guides/fractional-shortening/

# Left ventricular fractional shortening calculator

Review the end-diastolic and end-systolic dimension inputs used to calculate left ventricular fractional shortening.

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

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

## Method

FS = (LVIDd − LVIDs) ÷ LVIDd × 100

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

### LVIDd · end-diastole  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.

### LVIDs · end-systole  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.

## Sources and method context

ASE / EACVI · 2015 · Recommendations for Cardiac Chamber Quantification by Echocardiography in Adults · §1.1 Linear measurements · §2–2.2, pp. 6–7

[Primary reference](https://www.asecho.org/wp-content/uploads/2025/04/2015_ChamberQuantificationREV.pdf)

- Linear shortening and acquisition · §1.1 · §2–2.2, pp. 6–7

Matched end-diastolic and end-systolic linear dimensions, phase definitions, and limitations with regional dysfunction or conduction abnormalities. Fractional shortening is distinct from volume-derived EF; no severity thresholds are applied.

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)
- [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/)
- [Left ventricular ejection fraction calculator: LVEF](https://echosuite.app/guides/lv-ef/)

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