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A member asked:
How will i calculate my yellow and red ranges on a pef meter? or will my md tell me?
A doctor has provided 1 answer
Tables on net: Best way is to do a peak flow when you are feeling fine. The green zone is 80-100% of your peak flow. The yellow zone is from 60-80%. The. Red zone is below 60% of your peak flow. As you progress through the zones the pharmacological therapy of asthma will change.
Answered 4/10/2016
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