Peak Flow Zones

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You use the peak flow meter by taking a deep breath in and then blowing the air out hard into the peak flow meter. The peak flow meter then gives you a peak flow number that tells you how fast you moved the air out.
You will need to find out your "personal best" peak flow number. You do this by recording your peak flow number every day for a few weeks until your asthma is under control. The highest number you get during that time is your personal best peak flow. Then you can compare future peak flow measurements to your personal best peak flow, and that will show if your asthma is staying under control.
Your peak flow meter can help warn you of a possible asthma attack even before you notice symptoms. If your peak flow meter shows that your breathing is getting worse, you should follow your emergency asthma action plan. Take your quick-relief or other medicines as your doctor directed. Then you can use the peak flow meter to see how your airways are responding to the medicine.
Peak Flow Zones
Red:
Below 50 percent of your personal best peak flow measurement.
Medical alert, take quick-relief medication and seek medical help immediately.
Green:
80 to 100 percent of your personal best peak flow measurement.
Asthma is under control.
Yellow:
50 to 79 percent of your personal best peak flow measurement.
You may need to use quick-relief medications or other medication, as directed by your physician.
Peak Flow Zones:
Source: National Heart Lung and Blood Institute, National Institutes of Health. www.nhlbi.nih.gov