Colorimetric capnography

Technique for detecting carbon dioxide in exhaled gas

Colorimetric capnography is a qualitative measurement method that detects the presence of carbon dioxide in a given gaseous environment. From a medical perspective, the method is usually applied by exposing litmus paper/film to an environment containing a patient's airway gases, where it will then change color depending on the amount of exhaled CO2 within the circuit. Although there are multiple uses, the colorimetric capnography method is most frequently used to quickly confirm that an advanced airway device such as an endotracheal tube (ETT) or nasotracheal tube (NTT) has been placed in the desired location. Correct placement is evidenced by sufficient color change of the litmus paper while exposed to the airway gases which, if the device is properly placed, will contain relatively high amounts of exhaled CO2. Conversely, lack of detection of CO2 suggests many possible issues, including improper placement of the advanced airway device, most commonly into the esophagus. There are no contraindications to capnography.

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