Final answer:
For intubation at a stoma site, the endotracheal tube should be inserted 2 to 3 cm beyond the distal cuff to ensure proper placement without causing damage.
Step-by-step explanation:
When intubating a stoma site, it's important to insert the endotracheal tube just far enough for it to be effective without causing damage. According to clinical guidelines, the endotracheal tube should be inserted 2 to 3 cm beyond the distal cuff into the trachea. This distance ensures that the tube is past the stoma but not too far into the lower airways, which could lead to complications such as damage to the tracheal lining or improper ventilation.