Prehospital blood transfusion is rapidly expanding across EMS systems. Despite this momentum, the field lacks standardized outcome metrics to evaluate effectiveness, safety, operational performance, and equity. Current studies use inconsistent definitions and reporting practices, making it difficult for agencies to compare results, benchmark performance, or identify opportunities for program improvement. The variability in data collection limits the ability to understand which practices contribute to successful patient outcomes and which gaps may compromise safety or program sustainability. To address this, our team developed the first consensus-derived reporting framework for prehospital transfusion programs, modeled after the Utstein criteria for cardiac arrest.
Through a structured consensus process, we convened experts from EMS, trauma surgery, transfusion medicine, and resuscitation science to define essential metrics for evaluating prehospital blood programs. SEMSTAR's resulting framework includes standardized measures of clinical effectiveness, adverse events, operational performance, and patient-reported outcomes—creating a unified structure for transparent, reproducible reporting across systems. This session will present the SEMSTAR consensus-based metrics, demonstrate strategies for integrating them into EMS documentation and quality improvement processes, and highlight opportunities for multi-center collaboration. Participants will leave with actionable tools to strengthen their program's self-evaluation, enhance safety monitoring, and refine protocols using consistent, evidence-based outcome tracking.