Our study aims to assess role of ultrasonography FAST and US repeated after 12-24 hours in early diagnosis of intra-abdominal injury following blunt abdominal trauma & follow up US in patients with intra-abdominal injury. We concluded that US is considered the best modality in initial evaluation of blunt abdominal trauma patients, Repeated US in patients of blunt abdominal trauma increases the sensitivity of US for intra-abdominal bleeding to100%. Ultrasonography is very useful in follow up of patients with minor intra- abdominal injury & decreases use of CT. However, US is operator dependent, could overlook lacerations of solid organs & gastrointestinal injuries that CECT is still considered the gold standard in evaluation of the exact site & degree of intra-abdominal injury.