How are maximum expiratory pressures (MEP) measured in pulmonary function testing?

Updated: May 14, 2020
  • Author: Kevin McCarthy, RPFT; Chief Editor: Nader Kamangar, MD, FACP, FCCP, FCCM  more...
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MEP: Patients breathe through a flanged mouthpiece with nose clips in place. Patients are instructed to inhale to TLC. At TLC, a valve or shutter is closed and the patient is coached to exhale as forcefully as possible. Maximum push should be maintained for 1-2 seconds. Initial maximum positive pressures that cannot be maintained for a full 1 second are ignored.

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