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
Adam Husney, MD, MD - Family Medicine & Sue Barton, PhD, PsyD - Behavioral Health
How this information was developed to help you make better health decisions.