A peak flow meter is a small device that helps you check how well your asthma is controlled. Peak flow meters are most helpful if you have moderate to severe persistent asthma.
How to Measure Peak Flow
Measuring your peak flow can tell you and your health care provider how well you blow air out of your lungs. If your airways are narrowed and blocked due to asthma, your peak flow values drop.
You can check your peak flow at home. Here are the basic steps:
- Move the marker to the bottom of the numbered scale.
- Stand up straight.
- Take a deep breath. Fill your lungs all the way.
- Hold your breath while you place the mouthpiece in your mouth, between your teeth. Close your lips around it. DO NOT put your tongue against or inside the hole.
- Blow out as hard and fast as you can in a single blow. Your first burst of air is the most important. So blowing for a longer time will not affect your result.
- Write down the number you get. But, if you coughed or did not do the steps right, do not write down the number. Instead, do the steps over again.
- Move the marker back to the bottom and repeat all these steps 2 more times. The highest of the 3 numbers is your peak flow number. Write it down in your log chart.
Many children under age 5 cannot use a peak flow meter very well. But some are able to. Start using peak flow meters before age 5 to get your child used to them.
Find Your Personal Best
To find your personal best peak flow number, take your peak flow each day for 2 to 3 weeks. Your asthma should be under control during this time. To find your personal best, take your peak flow as close to the following times of day as you can:
- Between noon and 2 p.m. each day
- Each time after you take your quick-relief medicine to relieve symptoms
- Any other time your provider tells you to
These times for taking your peak flow are only for finding your personal best.
Write down the number you get for each peak flow reading. The highest peak flow number you had during the 2 to 3 weeks is your personal best.
Ask your provider to help you fill out an asthma action plan. This plan should tell you when to call the doctor for help and when to use medicines if your peak flow drops to a certain level.
Your personal best can change over time. Ask your doctor when you should check for a new personal best.
Use Your Peak Flow Meter Every Day
Once you know your personal best, make taking your peak flow a habit. Take your peak flow:
- Every morning when you wake up, before you take medicine. Make this part of your daily morning routine.
- When you are having asthma symptoms or an attack.
- After you take medicine for an attack. This can tell you how bad your asthma attack is and if your medicine is working.
- Any other time your doctor tells you to.
Check to see which zone your peak flow number is in. Do what your provider told you to do when you are in that zone. This information should be in your action plan. If you use more than one peak flow meter (such as one at home and another one at school or work), be sure that all of them are the same brand.
Peak flow meter - how to use; Asthma - peak flow meter; Reactive airway disease - peak flow meter; Bronchial asthma - peak flow meter
Bergstrom J, Kurth M, Hieman BE, et al. Institute for Clinical Systems Improvement website. Health Care Guideline: Diagnosis and Management of Asthma. 11th ed. www.icsi.org/wp-content/uploads/2019/01/Asthma.pdf. Updated December 2016. Accessed February 28, 2018.
Durrani SR, Busse WW. Management of asthma in adolescents and adults. In: Adkinson NF Jr, Bochner BS, Burks AW, et al, eds. Middleton's Allergy Principles and Practice. 8th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 55.
National Asthma Education and Prevention Program website. How to use a peak flow meter. How to use a metered-dose inhaler. www.nhlbi.nih.gov/health/public/lung/asthma/asthma_tipsheets.pdf. Updated March 2013. Accessed February 28, 2018.
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Review Date 2/18/2018
Updated by: Laura J. Martin, MD, MPH, ABIM Board Certified in Internal Medicine and Hospice and Palliative Medicine, Atlanta, GA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. 02-25-19: Editorial update.