A computer based system is disclosed for providing emergency medical personnel with a means for rapidly ascertaining an accurate estimated weight for a non-responsive and potentially critically ill patient. The system acquires the gross weight of the patient, the support upon which the patient is lying and all life support equipment that may be on that support. From data stored in a data base, and from information input into the system by the personnel on hand, the weights of everything except the patient are deducted by the system to arrive at the patient's weight. That weight is then resident in the system and serves to allow the system to accurately calculate the correct dosages of medications to be administered to the patient while warning the personnel if dangerous interactions are possible. The system includes protocols for treating a wide variety of emergency medical conditions in both hospital and military environments.