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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.
Last Revised: March 14, 2013
Author: Healthwise Staff
Medical Review: John Pope, MD - Pediatrics & Lora J. Stewart, MD - Allergy and Immunology
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