Background: The Danish Prehospital Medical Record (DPMR) represents a pioneering nationwide electronic prehospital medical record system. While routinely collected data from the DPMR are increasingly used for research, a comprehensive description of its system and content is needed. Objective: To provide an overview of the DPMR as a tool for research, including its structure, variables, and current volume of records. Methods: We examined the DPMR’s history, data structure, content, and data usage. We also analyzed aggregated DPMR data from 2016 to 2023 for selected key variables. Further, we searched MEDLINE to identify studies utilizing this data source in the past decade. Results: Since 2016, the DPMR system has grown to include 1.8 million unique prehospital patients with over 6 million associated patient contacts. For each patient contact, the DPMR compiles information on the emergency medical call (dispatch criteria, level of urgency, and pre-arrival treatment), characteristics of the incident (patient examination, treatment, response time, on-scene time, and transport time), emergency medical services units (ambulances, rapid response vehicles with paramedics, anesthesiologists in ground-based mobile emergency care units and/or helicopters, or patient transports without treatment capability), and extensive patient-related data. The system currently encompasses 528 variables, standardized across all emergency medical services units. There are a limited number of studies on the data quality of the system and the proportion of patients with missing civil registration numbers has varied between approximately 5% and 9%, which should be taken into account when using it for research. Conclusion: The DPMR is growing in importance as a research tool in Denmark. It provides nationwide patient-related and logistical prehospital data going back to 2016, enabling linkage with national registries for outcome research. Plain Language Summary: We conducted this study to provide a detailed description of the Danish Prehospital Medical Record (DPMR) that can help researchers plan future studies. The DPMR is a nationwide system used in ambulances and other medical emergency units in Denmark to document patient care. Our study examined its structure, data volume, and use in research. Since 2016, it has recorded over six million patient contacts, including details on emergency calls, patient conditions, and prehospital treatments, focusing on individual-level, patient-related data. The description provides researchers with a clearer foundation when designing future studies on patient care before hospital arrival as the DPMR is growing in importance as a research tool in Denmark.

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