Peak Expiratory Flow Rate

**Definition:** Measurement of the maximum rate of airflow attained during a FORCED VITAL CAPACITY determination. Common abbreviations are PEFR and PFR.

**Tree numbers:** - E01.370.386.700.660.225.600 - G09.772.650.300.790

**Synonyms:** - Flow Rate, Peak Expiratory - Expiratory Peak Flow Rate - PEFR