Health Library

Peak flow meter use - Series

Peak flow meter use - part one

A peak flow meter helps you check how well your asthma is controlled.

Use it every day, and keep track of the results to help your doctor learn about your asthma. This may also help you determine if your asthma is getting worse, even before you have symptoms.

Peak flow meter use - part two

First, move the marker to the bottom of the numbered scale.

Peak flow meter use - part three

Stand up straight with your head up, and take a deep breath. Fill your lungs all the way. (Standing helps you get more air in your lungs.)

Peak flow meter use - part four

Place the mouthpiece in your mouth, between your teeth. Close your lips around it. Do not put your tongue inside the hole or block the vents in the back.

Peak flow meter use - part five

Blow out as hard and fast as you can. You want to move the marker as far as you can with your breath, so concentrate on exhaling forcefully and quickly.

Peak flow meter use - part six

Move the marker back to the bottom, and repeat these steps two more times. If you cough or make a mistake, do not include this as one of your three tries.

Record the highest of the three numbers in your peak flow diary.

Peak flow meter use - part seven

Check which zone corresponds with your highest score. Follow the plan developed by you and your doctor for the appropriate zone.

If your best effort is in the red zone, take your relief medication immediately and call your doctor or go to the emergency room.

Related Information

Review Date: 1/22/2023  

Reviewed By: Denis Hadjiliadis, MD, MHS, Paul F. Harron, Jr. Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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