URL of this page: http://www.nlm.nih.gov/medlineplus/ency/patientimages/000116.htm

How to measure peak flow

How to measure peak flow

Overview

  • 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 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. If you coughed or did not do the steps right, do not write down the number. Do it over again.
  • Move the marker back to the bottom and repeat these steps 2 more times. The highest of the 3 numbers is your peak flow number. Write it down in your results log.

Update Date 4/26/2010