A new born girl not passed meconium for 48 hrs, has abdominal distention and vomiting, Initial investigation of choice would be
bowel obstruction with an absent caecal gas shadow in ileocolic cases. A soft tissue opacity is often visible in children. A barium enema may be used to diagnose the presence of an ileocolic intussusception (the claw sign) Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1196
Manometry
Genotyping for cystic fibrosis
Lower GI contrast study
Serum trypsin immunoblot
G.I.T