mrcem2-2071

A 35-year-old woman is brought into the emergency room by an ambulance with flashing lights. She has been in a car accident and has sustained severe burns. You examine her airway and have concerns about potential airway blockage. Your plan is to intubate the patient and begin preparing the required equipment.
As per the ATLS guidelines, what is the minimum internal diameter of the endotracheal tube that should be utilized?