The peak nasal inspiratory manoeuvre should be a short, sharp inspiratory action of about one-second in duration
The inspiratory flow should be noted and the In-Check reset as above.
The peak nasal inspiratory flow test should be repeated three times, and the highest result recorded in the patient’s records.
Note: Spectacles should be removed. The mouth must be closed.
Care should be taken to ensure that the mask forms an airtight seal against the face. Different masks may be available in a variety of sizes to suit different facial shapes.
The mask should be disinfected between patients to avoid the risk of cross infection.