Electronic patient records are important in patient data management. Aim of this 2-year study was to investigate the effect of an e-documentation system on the ED length of stay. The study compared three length of stay parameters with and without the use of a prototype e-documentation system. 99 of trauma patients were monitored with the use of the electronic system and 101 patients (control group) were monitored with traditional methods. Time between the admission and completion of care was significantly lower in the e-documentation group (100±92 minutes, control group: 149±29 minutes). Similar effect was also found to the total ED length of stay (127±93 vs. 206±41 minutes) and time between completion of care and ED exit (26±10 vs. 57±23 minutes). LOS was reduced with the e-documentation system. This is important for the quality of trauma patient care, since saving time during the first hours after the accident usually determines the outcome of trauma patients.