Background and Objective: Emergency operating roomsmust be readiness for emergency procedure. Their key performance index is “all patients received procedure within optimized time depend on triage”. So, we would like to study percentage of patients that received procedure within optimized time during in-office hour and process time of each steps, including obstacles for quality improvement.

Methods: This study was prospective descriptive study. We studied in patients who received service in emergency operating room during in-office hour. Data were sought from medical record and study record. Patients were classified depend on their emergency condition group by surgeons (triage). We recorded process time of each steps from request for service until finished procedure. We also recorded obstacles.

Result: One hundred and thirty-two patients were included into study. None of true emergency cases were received procedure within 15 minutes. Emergency cases that received procedure within 1 hour were 65.2%. Urgency cases that received procedure within 6 hours was 91.8%. And all elective cases received procedure within expected period. Median of waiting time was 2 hours. Obstacles were insufficient operating room, working process problem, patient preparation problem, coordination problem, and patient transferring problem.

Conclusion: Some patients did not receive procedure within optimized time period. Obstacles were insufficient operating room, working process. Systematic operating room management might improve patient case quality.