Peak expiratory flow rate
The peak expiratory flow rate measures how fast a person can exhale air. It is one of many tests that measure the function of the airways, which are commonly affected by diseases such as Asthma, or Chronic obstructive pulmonary disease (COPD, usually a combination of Emphysema and Chronic bronchitis).
by Levon Ter-Markosyan, D.M.D.
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