A patient is instructed to inhale deeply and blow into a peak expiratory flow monitor three times. Peak Expiratory Flow Rate (PEFR) can be measured as part of spirometry testing (see Spirometry measure) or as a separate measurement. The highest PEFR value is typically used for analysis. A minimum of three acceptable blows is necessary. The maneuver can be performed in either the sitting or standing position, but one of these options should be used in a standardized manner within a particular study.
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