peak expiratory flow (PEF)

Peak expiratory flow (PEF) measures how quickly a person can force air out of their lungs after a full inhale. It provides a simple way to assess lung function, especially in conditions like asthma. A high PEF indicates clear, open airways and good lung capacity, while a lower PEF suggests airway narrowing or obstruction. By regularly monitoring PEF, individuals can detect early signs of breathing issues and manage their respiratory health more effectively. PEF is usually measured using a handheld device called a peak flow meter, making it a convenient tool for ongoing assessment.