What are contraindications to a diffusing capacity of lung for carbon monoxide (DLCO) test?

Updated: May 14, 2020
  • Author: Kevin McCarthy, RPFT; Chief Editor: Nader Kamangar, MD, FACP, FCCP, FCCM  more...
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Inability to follow instructions is a contraindication to a DLCO test (CPT code 94729). Patients should be alert, oriented, able to exhale completely and inhale to total lung capacity, able to maintain an airtight seal on a mouthpiece, and able to hold a large breath for 10 seconds.

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