How do you determine whether the endotracheal tube is in the trachea or esophagus?

To determine if an endotracheal tube is in the trachea or esophagus, you can assess for proper breath sounds by auscultating the chest and confirming bilateral breath sounds. Additionally, observing the tube's position and checking for the presence of carbon dioxide using a capnometer can provide evidence of correct placement in the trachea, as CO2 will be present in exhaled air. Visualizing the tube's passage through the vocal cords during intubation also indicates correct placement. Lastly, an X-ray can be used to verify the tube's location.