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A peak flow meter is an inexpensive, pocket-size device that measures peak expiratory flow (PEF), or how much air a person can breathe out. To measure PEF, the person takes a deep breath and then blows into a tube on the peak flow meter as hard and as fast as possible. This can be done at home.
Peak flow meters come in many shapes and sizes.
Current as of: March 25, 2017
Author: Healthwise Staff
Medical Review: John Pope, MD - Pediatrics & Elizabeth T. Russo, MD - Internal Medicine
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