Peak flow meters

Photo of kinds of peak flow meters

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A peak flow meter is an inexpensive, pocket-sized device that measures peak expiratory flow (PEF), or how fast 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 Updated: March 20, 2009

Medical Review: Michael J. Sexton, MD - Pediatrics & Harold S. Nelson, MD - Allergy and Immunology

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