Definitions for "PEFR"
PEFR represents the maximum rate of flow of air you can blow out which is one way of measuring the function of your lungs. Asthma patients who are have some airway obstruction will notice that their PEFR measurements will begin to decrease as symptoms get worse.
Peak expiratory flow rate. A useful measurement of lung function.
Peak Expiratory Flow Rate. Measurement of the maximum rate of airflow attained during a forced vital capacity determination.