Result:
PEF Variabilty
| 0-14 Variability: | Uncharacteristic of Asthma |
| 15-19 Variability: | Supports dx of asthma |
| 20-30 Variability: | Mild Persistant Asthma |
| 31-100 Variability: | Moderate to severe persistant |
| AvgDailyVariability = 100 * (HighestPEF - LowestPEF) / HighestPEF |
References:
Global strategy for asthmatic management and prevention. NHLBI/WHO International Report.
ACAAI Asthma Disease Management Resource Manual, 1997