Peak expiratory flow
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Peak expiratory flow
Peak expiratory flow (PEF) is a measure of how fast a person can exhale while breathing out as hard and fast as possible. PEF is used to evaluate the condition of the airways in people who have asthma or other conditions that affect the ability to breathe.
When the airways become narrowed because of inflammation or disease, the peak expiratory flow drops. A decrease in the peak rate can show that the bronchial tubes have narrowed even before symptoms of asthma develop.
Peak expiratory flow may be measured at home using an inexpensive device called a peak flow meter, or it may be measured in a health professional’s office using a spirometer.
Credits
| Author | Jeannette Curtis |
| Author | Caroline Rea, RN, BS, MS |
| Editor | Kathleen M. Ariss, MS |
| Editor | Susan Van Houten, RN, BSN, MBA |
| Associate Editor | Tracy Landauer |
| Associate Editor | Pat Truman |
| Primary Medical Reviewer | Patrice Burgess, MD - Family Medicine |
| Primary Medical Reviewer | Adam Husney, MD - Family Medicine |
| Primary Medical Reviewer | Kathleen Romito, MD - Family Medicine |
| Last Updated | May 25, 2007 |
| Last updated: | May 25, 2007 |
|---|---|
| Author: | Caroline Rea, RN, BS, MS |
| Reviewed By: | Kathleen Romito, MD - Family Medicine |
| Editors: | Susan Van Houten, RN, BSN, MBA, Pat Truman |
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