A Peak Flow Meter (PFM) is used to measure air flow out of your lungs. After inhaling deeply, you blow out into the tube as hard as you can. The highest number you reach is called the Peak Expiratory flow (PEF). People with persistent types of asthma can use these readings to see how well their asthma is controlled.
To begin with, when you are diagnosed with persistent asthma (regular attacks) it is recommended that you and your health care professional work out an Asthma Control Plan. To make this plan work well you have to have some groundwork. By using the peak flow meter 2 times daily (at the same time every day) for 2-3 weeks you can determine your "personal best". This is the highest peak expiratory flow reading on the days you feel you are under good control. You can now set your asthma action plan (a future blog) with your health care provider.
The peak flow meter can also be used when you are having an attack or predict an attack. In asthma, the airways tighten and so air flow out of the lungs is reduced ( the peak flow meter will read a number well below your personal best). When these number fall below 80% of your personal best you can put your action plan into effect.
Peak flow meters can also be used in children down to the age of 4. Remember, without an Asthma Action Plan your peak flow readings are just numbers.
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