RT Journal Article SR Electronic T1 PP32  Major trauma triage tools study (MATTS) expert consensus meetings JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP e14 OP e16 DO 10.1136/emermed-2020-999abs.32 VO 37 IS 10 A1 Holt, Christopher A1 Fuller, Gordon A1 Keating, Samuel A1 Turner, Janette A1 Goodacre, Steve A1 Smith, Jason YR 2020 UL http://emj.bmj.com/content/37/10/e14.3.abstract AB Introduction Major trauma triage tools are used to identify patients for bypass to Major Trauma Centres (MTCs). Bypass has been associated with improved patient outcomes following major trauma. The aim of the Major Trauma Triage Tools Study (MATTS) is to produce an evidence-based triage tool to be implemented across UK ambulance services.Methods Two independently chaired 1-day expert consensus meetings comprised of senior clinical professionals from specialties relevant to major trauma and prehospital triage were conducted as part of Phase 1 of the MATTS project, each with a distinct focus:To define a reference standard of major traumaProduce a new triage toolFacilitated round table discussions were conducted with consensus developed through arbitration. In the first meeting a multi-domain reference standard defining major trauma patients with the potential to benefit from MTC care was determined. In the subsequent meeting triage tools were developed to select appropriate injured patients meeting this reference standard.ResultsThree tools were produced with a different diagnostic accuracy focus:Sensitive – Maximising major trauma identification.Specific – Preserving MTC care for the most severely injured patientsBalanced – A tool balancing sensitivity and specificityConclusion The reference standard will form the basis of data analysis in Phase 2 of the project. The performance of the 3 differing tools will be tested in a dataset of routine ambulance service and TARN data. Following this, the most optimal triage tool will be assessed in clinical practice across 4 ambulance services.