American College of Emergency Physicians Standards

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"End-tidal CO₂ detection, either qualitative, quantitative or continuous, is the most accurate and easily available method to monitor correct endotracheal tube position in patients who have adequate tissue perfusion."

AHA 2000

American Heart Association

Emergency responders must confirm tracheal tube position by using nonphysical examination techniques. These include esophageal detector devices, quantative end-tidal C02 indicators, and capnographic and capnometric devices, this includes capnography.

SCCM 1993

Society of Critical Care Medicine

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Monitoring during transport shall include capnography on selected patients based on clinical status.