Abstract. Objective: To compare pediatric patients transported by ambulance on more than one occasion (repeat) with those transported only once. Methods: The authors analyzed pediatric (patient < 21 years old) transports for 1992-1995 by the ambulance service that provides 99% of transports for a non-innercity metropolitan area. Repeat transports were compared with single transports with regard to patient age, gender, chief complaint, and payment source. Results: There were 17,448 transports involving 15,168 patients. Nearly half (49.0%) of the repeat transports involved patients in the oldest age category, 17 to 20.9 years, contrasted with 38.0% of single transports (p < 0.00001). Females comprised 51.4% of the repeat transports and 48.5% of the single transports (p = 0.0008). Traumatic complaints accounted for onethird (33.0%) of the repeat transports and half (51.1%) of the single transports (p < 0.0001). Chief complaints of the patients with repeat transports were more likely to be seizure, assault, abdominal pain, and respiratory problems, and less likely to be falls and motor vehicle-related complaints, than chief complaints of the patients with single transports (p < 0.0001). More than one-third (39.0%) of the repeat transports were funded by Medicaid, in contrast with 19.8% of the single transports (p < 0.0001). Conclusions: Compared with single transports, repeat transports were more likely to involve patients more than 16 years of age, female, and with a chief complaint of seizure, assault, abdominal pain, or respiratory distress, and more likely to be funded by public insurance (Medicaid). Repeat pediatric transports warrant further investigation. This information may be useful in designing interventions targeted at reducing emergencies and hence ambulance use. Key words: repeat emergency medical service; pediatric emergency medical service; ambulance; adolescents; health care financing. ACADEMIC EMERGENCY MEDICINE 2000; 7:36-41 I N RECENT years, pediatric emergency medical services (EMS) have received increasing attention, but research needs are still great.1,2 Children constitute 6-10% of all EMS transports.1,3-6 Analysis of EMS data is an underutilized method for following trends in ambulance use.7 Data from an EMS service can provide comprehensive, community-wide information. In contrast, data from a single hospital do not include information on patients who are transported repeatedly, but are treated at more than one ED. Research has been done on adult repeat EMS use. acute alcohol intoxication, and respiratory conditions involved only 4.3% of patients, yet accounted for 28.4% of transports.8 Only one study, by Yamamoto et al.,9 analyzed data on repeat EMS use in children. The Yamamoto study, however, had a small sample size (n = 36) of children transported more than once. Therefore, it is difficult to generalize these results. Developing a profile of individuals at high risk for repeat use of EMS may help in the development of targeted prevention activities. 10,11 The prevalence of repeat EM...