Abstract: A surgical procedure done under general anesthesia in which a patient is first operated on in an operating room and thereafter moved from the operating room to a recovery room is disclosed herein. During general anesthesia the patient is administered oxygen from a first oxygen source through a cooperating tube disengagably connected at a first end to the source and at a second opposite end to a mask or endotracheal tube attached to the patient in a way that allows the patient to receive oxygen from the source. After surgery, while being moved from the operating room to a recovery room, the patient is administered oxygen from a second, portable source using the very same cooperating tube. Specifically, after the patient has begun spontaneous ventilation, the first end of the cooperating tube is disconnected from the original oxygen source and reconnected to the portable source.