The purpose of a peak flow meter is to

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A peak flow meter is a device that measures how quickly air flows out of the lungs, which is known as peak expiratory flow rate (PEFR). This measurement helps individuals with asthma to monitor changes in lung function and to determine if their asthma is under control. While a peak flow meter may be used in the diagnosis or management of asthma, its primary purpose is to measure lung function. It does not prevent asthma attacks or deliver medication to the lungs.

The Purpose of a Peak Flow Meter Is to