After how many breaths should you assess for evidence of exhaled carbon dioxide after intubation?

• A. 3 breaths
• B. 5 to 6 breaths
• C. 7 to 8 breaths
• D. 9 to 10 breaths

Answer: (B)

Capturing End-tidal CO2 after intubation confirms that the tube is in the trachea and that ventilation is effective. You assess for exhaled CO2 across several consecutive breaths to ensure the signal is reliable and not just a momentary artifact, and five to six breaths is the practical window for that confirmation. If CO2 is not detected or the waveform remains inconsistent after that window, you should reassess tube placement and ventilation. Continuous capnography is the preferred method, with a consistent waveform indicating proper airway placement and ventilation.