This document describes Utah's method for linking trauma and pre-hospital data without using patient names. It discusses limitations like different data recording practices and lack of names in the trauma registry. It explores using birthdate, sex, social security number, hospital, and arrival date for matching. Statistical analysis suggests false matches would be rare even with many patients. The method successfully matched 71% of trauma patients to pre-hospital data with 99% accuracy in a validation sample. The linkage process is considered valuable for ongoing use while names are added to the trauma registry.