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Peak expiratory flow rate - Overview

Alternative Names

Peak flow

Definition of Peak expiratory flow rate:

The peak expiratory flow rate measures how fast a person can breathe out (exhale) air. It is one of many tests that measures how well the lungs are working.

How the test is performed:

This test requires a peak expiratory flow monitor: a small handheld device with a mouthpiece at one end and a scale with a moveable indicator (usually a small plastic arrow).

To perform this test:

  • Breathe in as deeply as possible.
  • Blow into the instrument's mouthpiece as hard and fast as possible.
  • Do this three times, and record the highest flow rate.

How to prepare for the test:

Loosen any tight clothing that might restrict your breathing. Sit up straight or stand while performing the tests.

How the test will feel:

There is usually no discomfort. Rarely, repeated efforts may cause some light-headedness.

Why the test is performed:

The test is commonly used to diagnose and monitor lung diseases such as:

Home monitoring can help determine whether treatments are working or detect when your condition is getting worse.

  • Reviewed last on: 10/14/2009
  • Andrew Schriber, MD, FCCP, Specialist in Pulmonary, Critical Care, and Sleep Medicine, Virtua Memorial Hospital, Mount Holly, New Jersey. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

National Asthma Education and Prevention Program Expret Panel Report 3: Guidelines for the Diagnosis and Management of Asthma. Rockville, MD. National Heart, Lung, and Blood Institute, U.S. Dept. of Health and Human Services; 2007. NIH publication 08-4051.

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