Abstract: A multi-functional nasogastric tubular device for insertion into a patient includes an elongated flexible body having a pair of spaced apart opposite proximal and distal ends, a plurality of spaced apart lumens formed in the body so as to extend side-by-side with respect to one another between the proximal and distal ends of the body and being open at least at the proximal end of the body, and a temperature sensor disposed on the body, such as in one of the lumens of the body, and running from the proximal end of the body to the distal end thereof such that the temperature sensor is adapted to monitor internal core temperature of a patient and also to serve as a radiopaque element for marking the position of the elongated body in the patient.