To investigate gastrointestinal bleeding this test is sometimes indicated. This test involves injection of a radio-isotope into a vein which then collects in particular tissues containing gastric lining acid producing cells. A Meckel’s diverticulum is a remnant of the embryological development which is an out-pouching of the small bowel and present in 2% of the population, this can have an ulcer present in it because of gastric tissue which is not normally there producing acid. This will be highlighted as a hot spot on a special type of scan after injection of this radio-isotope. It requires a morning being set aside but no anaesthetic is necessary, albeit it with an injection.