Definition of Peak expiratory flow
Peak expiratory flow: Abbreviated PEF. The maximum airflow during a forced expiration beginning with the lungs fully inflated. The PEF is reduced in proportion to the severity of the airway obstruction, as in asthma and COPD (chronic obstructive pulmonary disease).Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012
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