EpistemisMaximum Expiratory Flow: Variability, Zones and Predicted Value
The diurnal variability of peak expiratory flow is a diagnostic criterion for asthma in itself, and the colored zones are the basis of any written action plan. The prediction uses the Nunn and Gregg equations, which are the ones most European scale meters are calibrated for.
Required inputs
| Variable | Example value |
|---|---|
| Highest maximum expiratory flow of the series (L/min) | 420 |
| Lowest maximum expiratory flow of the series (L/min) | 340 |
| Personal best reference value (L/min) | 500 |
| Current value to place in the zone (L/min) | 380 |
| Age (years) | 35 |
| Size (cm) | 175 |
| Sex | — |
Run the calculation in the app
This page explains the score but does not run it. In Epistemis, the calculator validates units, flags values outside physiological ranges, and provides the interpretation that a number alone cannot convey.
Epistemis is educational review material. It is not a medical device, does not diagnose or prescribe treatment, and does not replace formal medical training, current clinical guidelines, or professional clinical judgment.
- Specialty
- Pneumology and Respiratory
- Area
- Internal Medicine
- Variables
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