What is the correct depth for endotracheal tube placement in adults?

The correct depth for endotracheal tube placement in adults typically falls within the range of 21-25 cm at the lips. This measurement is generally accepted based on average anatomical landmarks for most adult patients and serves as a guideline to ensure that the tube is placed correctly within the trachea, avoiding both accidental extubation and endobronchial intubation.

Placement within this depth range helps to secure adequate ventilation and oxygenation by ensuring that the cuff of the endotracheal tube is located below the vocal cords while avoiding advanced placement into the mainstem bronchi, which could lead to complications such as unilateral ventilation. It’s important for practitioners to be aware that individual anatomical variations might necessitate adjustments to this range, and continuous confirmation with tools like capnography or chest auscultation should be undertaken to verify proper tube placement.