History and Objectives: Due to the prevalence of blunt abdominal trauma and availability, relative ease, economic consideration of sonographic applications and current controversy regarding sonography on diagnosis of intra-abdominal injury, the present study was carried on blunt abdominal traumatic patients at Rasul hospital in 1997-98 in order to assess the diagnostic power of sonography on intra-abdominal injury.

Materials and Methods: A clinical diagnostic experimental study was performed and patient’s information and characteristics of the injury was recorded. Definite diagnosis of injuries was based on CT scan and laparotomy findings. PPV and NPV of sonography were defined.

Results: Study covered 94 patients (76.6% male and 23.4% female) with age of 26.9±14.8 years. Car accident was the major cause of trauma. PPV and NPV of sonography for diagnosis of intra-abdominal organs injury were 76.5 and 84.8 respectively and for diagnosis of intra-abdominal free fluid were 100 and 96.6 respectively.

Conclusion: Sonography has sufficient power for diagnosis of intraperitoneal free fluid however it dose not have sufficient power for diagnosis of intraperitoneal organs injury. Further study regarding the cause of low power is recommended.