<prompt> Best diagnosis of the ectopic gastric mucosa of Meckels diveiculum is byFluoroscopyOccult blood test in stoolUltrasound abdomenRadionuclide scan  <response>: Plain abdominal radiography, CT, and ultrasonography are rarely helpful.In children, the single most accurate diagnostic test for Meckels diveicula is scintigraphy with sodium 99mTc-peechnetate. The 99mTc-peechnetate is preferentially taken up by the mucus-secreting cells of gastric mucosa and ectopic gastric tissue in the diveiculum. The diagnostic sensitivity of this scan has been repoed as high as 85, with a specificity of 95 and an accuracy of 90 in the pediatric age group.In adults, however, the sensitivity of 99mTc-peechnetate scan falls to 63 because of the presence of less gastric mucosa in the diveiculum compared with that noted in the pediatric age group.Sabiston 20e pg:1310 