Abdominal trauma is common in Madagascar and is responsible for high mortality due to haemorrhagic complications and digestive perforation. Ultrasound plays an important role in the lesion assessment. The objective of this study is to determine the sensitivity and specificity of ultrasound in the diagnosis of traumatic abdominal lesion. It was a prospective and analytical study over a period of eight months, conducted at the medical imaging centre and emergency department of the CHU-JRA. A total of 408 patients were retained, whose mean age was 26.43 years. Ultrasound was normal in 67% of cases and hemoperitoneum was objectified in 17.40% of cases, so traumatic abdominal lesions represented 19.36% of cases, dominated by hepatic, renal, splenic and pancreatic lesions. No lesions of the digestive hollow organs were diagnosed on ultrasound. Ultrasound has a sensitivity of 60% and a specificity of 99% for the detection of traumatic abdominal lesions.