<prompt> Best investigation to diagnose Meckel;s diveiculum?X-ray abdomenUltrasonographyBarium studyTc 99m Peectinate scan  <response>: . Technetium Tc99 radioisotope scan is very useful 90-95 accuracy. Ninety per cent of heterotrophic gastric mucosa can be identified in Meckels diveiculum by radioisotope study. It can detect Meckels divei-culum with minimal bleeding also 0.1 mlminute. So it is very useful investigation in children presenting with bleeding. X-ray abdomen to see complications like obstruction, perforation. Laparoscopy is very useful. Enteroclysissmall bowel enema under fluoroscopy may show the Meckels diveiculum. It is probably the most accurate investigation. ref:SRB;s manual of surgery,ed 3,pg no 798 