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 guiding the caller to obtain information that can be used by the diagnostic tool to diagnose whether the patient has suffered a stroke; the diagnostic tool presenting to the dispatcher a user interface (200, 300); the diagnostic tool providing diagnostic instructions (502, 504, 506; 602, 606, 610, 618, 624, 628, 638, 644, 648, 658, 664) via the user interface for the dispatcher to vocally relay to the caller over the telephone to assist the caller in identifying signs and symptoms that the patient has likely suffered a stroke; the diagnostic tool providing input fields (320, 322, 324) via the user interface by which the dispatcher can enter input indicative of caller-relayed information concerning the caller's observations of signs and symptoms of a stroke, wherein the input fields comprise a plurality of radio buttons associated with each potential caller observation; the diagnostic tool receiving, using the radio buttons, dispatcher-entered input indicative of caller-relayed information concerning the caller's observations of the responses of the patient to the diagnostic instructions, wherein the caller's observations are vocally relayed over the telephone to the dispatcher; the diagnostic tool determining a score based on the dispatcher-entered input for each response of the patient, wherein each score is associated with one of the radio buttons and is indicative of a significance of the response of the patient in indicating that the patient has suffered a stroke; the diagnostic tool providing via the user interface an indicator of the level of importance of each patient response in a plurality of answer fields; and the diagnostic tool determining (514, 614, 616, 622, 634, 636, 642, 654, 656, 662, 668, 670, 672) the likelihood that the patient has suffered a stroke based on the dispatcher-entered input indicative of the caller-relayed information. 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 guiding the caller to obtain information that can be used by the diagnostic tool to diagnose whether the patient has suffered a stroke; the diagnostic tool presenting to the dispatcher a user interface (200, 300); the diagnostic tool providing diagnostic instructions (502, 504, 506; 602, 606, 610, 618, 624, 628, 638, 644, 648, 658, 664) via the user interface for the dispatcher to vocally relay to the caller over the telephone to assist the caller in identifying signs and symptoms that the patient has likely suffered a stroke; the diagnostic tool providing input fields (320, 322, 324) via the user interface by which the dispatcher can enter input indicative of caller-relayed information concerning the caller's observations of signs and symptoms of a stroke, wherein the input fields comprise a plurality of radio buttons associated with each potential caller observation; the diagnostic tool receiving, using the radio buttons, dispatcher-entered input indicative of caller-relayed information concerning the caller's observations of the responses of the patient to the diagnostic instructions, wherein the caller's observations are vocally relayed over the telephone to the dispatcher; the diagnostic tool determining a score based on the dispatcher-entered input for each response of the patient, wherein each score is associated with one of the radio buttons and is indicative of a significance of the response of the patient in indicating that the patient has suffered a stroke; the diagnostic tool providing via the user interface an indicator of the level of importance of each patient response in a plurality of answer fields; and the diagnostic tool determining (514, 614, 616, 622, 634, 636, 642, 654, 656, 662, 668, 670, 672) the likelihood that the patient has suffered a stroke based on the dispatcher-entered input indicative of the caller-relayed information.