Peak expiratory flow

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What Wikipedia says

The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR) and peak flow measurement, is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air.

Excerpt from the Wikipedia article “Peak expiratory flow”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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