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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 measure how well your airways work.

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 do this test:

  • Breathe in as deeply as possible.
  • Blow into the instrument's mouthpiece as hard and fast as possible.
  • Do this 3 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: 11/12/2007
  • Andrew Schriber, M.D., F.C.C.P., Specialist in Pulmonary, Critical Care, and Sleep Medicine, Virtua Memorial Hospital, Mount Holly, New Jersey. Review provided by VeriMed Healthcare Network.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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