Intussusception is primarily diagnosed based on medical history, symptoms, physical signs, and auxiliary examinations. Medical history is mainly gathered by asking the parents, which is very important. Physical signs involve the doctor performing an abdominal palpation, where generally a mass can be felt on the abdominal wall. Auxiliary examinations usually include abdominal ultrasonography and upright abdominal plain films. For more complicated cases or when the location is unique and difficult to detect, a CT scan of the intestines may be performed to make the final diagnosis.