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


1. Buzoianu E, Moiceanu M, Plesca DA. Asthma Control Assessment in Children: Correlation between Asthma Control Test and Peak Expiratory Flow. Maedica (Buchar) 2014; 9:338.

2. National Asthma Education and Prevention Program: Expert Panel Report III: Guidelines for the diagnosis and management of asthma. Bethesda, MD. National Heart, Lung, and Blood Institute, 2007. (NIH publication no. 08-4051) includes risk tools and content intended for use by healthcare professionals. These tools do not give professional advice; physicians and other healthcare professionals who use these tools or databases should exercise their own clinical judgment as to the information they provide.
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