Peak expiratory flow rate (PEFR) is the maximum flow rate generated during a forceful exhalation, starting from full lung inflation. Peak flow rate primarily reflects large airway flow and depends on the voluntary effort and muscular strength of the patient. The most frequent use of peak flow rate measurement is in home monitoring of asthma and COPD (chronic obstructive pulmonary disease), where it can be beneficial in patients for both short and long term monitoring.

 

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