Background: Hospital beds are among valuable resources for care delivery. Therefore, optimum use of them is crucial for increasing the efficiency of health-care services and controlling health-care costs. Objective: This study intended to evaluate inappropriate patient stay (IPS) in hospital settings and its reasons based on the appropriateness evaluation protocol. Methods: This cross-sectional study was conducted on 335 patients hospitalized in a tertiary care university hospital. Data were gathered prospectively by 13 hospital nurses during a 6-month period. IPS rate was evaluated using a checklist, the 27 criteria of which were related to medical services, nursing/life support services, and patient's conditions. Moreover, a 12-item checklist was used to determine physician-, hospital-, and patient/family-related factors behind inappropriate hospital stay. Results: In total, 121 of 1925 (6.3) hospitalization days of 335 patients were determined to be inappropriate. Neurosurgery and gynecology wards had the highest and the lowest inappropriate hospital stay rates (22.5 vs. 0), respectively. The main reasons behind inappropriate hospital stay were hospital-related factors (33.1), physician-related factors (29.1), and patient-related factors (21.3). Conclusion: A wide variety of physician-, hospital-, and patient/family-related factors contribute to IPS. Given the multifactorial causes of IPS, reducing its rate necessitates multidisciplinary approaches
