1. A computer-implemented method to assist a dispatcher when communicating with a caller via telephone regarding a medical emergency of a patient, comprising: a dispatch center computer system providing an emergency dispatch protocol to assist the dispatcher, the protocol presenting a plurality of pre-scripted interrogatories for the dispatcher to ask the caller to gather information regarding the emergency and generate an emergency dispatch response by emergency responders; the dispatch center computer system initiating a diagnostic tool on the dispatch center computer, the diagnostic tool configured to assist the dispatcher in determining a burn surface area on the patient; and the diagnostic tool presenting to the dispatcher a user interface comprising a portrayal of a human body divided into a plurality of sections to enable a dispatcher to quickly sum a surface area of each of the sections that correspond to burned areas of the patient's body to determine the burn surface area of the patient.