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Most pharmacies that stock peak flow meters are located near arespiratory clinicor employ a pharmacist who is a certified asthma educator. Can you buy a peak flow meter over the counter? Credit: A peak flow test involves blowing as hard as you can into a small handheld device called a peak flow meter.

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  • How to use a peak flow meter?

  • Make sure the red marker is at the bottom of the meter. Take a deep breath, filling your lungs completely. Place the mouthpiece in your mouth. Close your lips tightly on the peak flow meter鈥檚 mouthpiece. Blast the air out as hard and as fast as possible in a single blow. Write down the number by the red marker on the meter.

  • How do I find my personal best peak flow number?

  • Each person’s asthma is different, so your personal best peak flow number may be different from another person’s personal best number. To find your personal best peak flow number, take your peak flow each day for two to three weeks. Your asthma should be under good control during this time.

  • Why do I need to keep track of peak flow?

  • Readings from the meter can help you or your child recognize early signs of worsening asthma. Keeping track of peak flow numbers is part of your Asthma Action Plan.

  • How often should I check my peak flow?

  • Checking your peak flow every day can help you keep an eye on your asthma and could cut your risk of an asthma attack Find out how to test your peak flow, what your scores mean, and how you can make the most of using peak flow to help you manage your asthma. On this page: What is peak flow? When to check your peak flow