Air Flow Through The Respiratory System Anatomy

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Definition

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.


Alternative Names

Peak flow


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...
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