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Peak flow meters come in many shapes and sizes, but they work about the same. Follow these steps to measure your peak flow.
1. Set the pointer of the peak flow meter to 0 or the lowest number on the meter.
2. If there is a separate mouthpiece, attach it to the meter.
3. Sit up or stand up as straight as you can. Take a deep breath.
4. Close your lips tightly around the mouthpiece. Keep your tongue away from the mouthpiece. Keep your fingers away from the number scale.
5. Blow out as hard and as fast as you can.
6. Note the number on the meter, and write it down. Do the test 2 more times. The highest of these 3 tests is your peak flow.
Current as of: May 1, 2026
Author: WebMD Ignite StaffClinical Review BoardAll WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
Author: WebMD Ignite Staff
Clinical Review BoardAll WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
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