Background: Guidelines for the Diagnoses and Management of Asthma recommend that the peak flow meter should be used in a standing position.
Objective: To determine whether the peak expiratory flow (PEF) varies with the position of the subject and to evaluate the impact of application of nose clip on PEF measurement.
Methods: Using a Mini Wright Peak Flow Meter, the PEF was measured in 33 healthy adults in sitting and standing positions, with and without application of a nose clip. Each subject blew into the peak flow meter three times and best of the 3 blows was recorded.
Results: The PEF was not significantly higher in standing than in sitting position. Application of nose clip had no significant impact on the PEF.
Conclusion: The position of the subject and application of nose clip has no significant impact on PEF measurement.