Peak Flow Meters

How to use a Peak Flow Meter

Move marker to zero or to the lowest number on the scale.

  1. Sit up straight or stand up.
  2. Take a deep breath.
  3. Close your lips around the mouthpiece (but keep your tongue clear of the opening).
  4. Blow out as hard and fast as you can into the mouthpiece.
  5. Take the meter out of your mouth.
  6. Write down the number.
  7. Repeat this test 2 more times.
  8. Write the date, the time and the highest of the 3 numbers in your record book/diary.


How to calculate your Personal Best Peak Flow Reading

Your personal best is the most air you can blow into your peak flow meter when your asthma is under control. When your asthma is under control, measure your peak flow reading every day for two weeks. Each day write down the best or highest number you reached. At the end of two weeks circle the highest number. This is your personal best.

  Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Week 1              
Week 2              



How to maintain your meter

  • Routinely examine your meter to make sure it is in proper working order.
  • Make sure the meter is free of foreign objects such as food particles.
  • The indicator and piston should move smoothly and freely.
  • The indicator should remain in place when moved to a position on the scale.
  • DO NOT USE A DAMAGED METER; see a medical provider for a replacement.

How to clean your meter:

  1. Wash your hands.
  2. Warm water and a mild liquid soap should be used to clean your meter.
  3. Rinse thoroughly and air dry completely prior to use.

Note: The some inhalers may be dishwasher safe. Follow the manufacturer’s instructions on all peak flow meters.

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