Peak expiratory flow | 合法醫療器材資訊網

Thepeakexpiratoryflow(PEF),alsocalledpeakexpiratoryflowrate(PEFR),isaperson'smaximumspeedofexpiration,asmeasuredwithapeakflowmeter, ...

A peak flow meter issued in the UK.

The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR), is a persons maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a persons ability to breathe out air. It measures the airflow through the bronchi and thus the degree of obstruction in the airways. Peak expiratory flow is typically measured in units of liters per minute (L/min).

Peak flow readings are higher when patients are we...