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A peak flow meter is a handheld device that measures how fast you can blow air out of your lungs in a single, forceful breath. This measurement, known as peak expiratory flow (PEF), helps monitor lung function, particularly for people with asthma or other chronic lung conditions, by providing an indicator of airway obstruction. It is used to track how well your lungs are working over time, help assess if your medication is effective, and provide an early warning for worsening symptoms before they become severe.
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