A newborn baby has not passed meconium for 48 hours since bih. She has vomiting and distension of abdomen. The most appropriate investigation for evaluation would be: (A) Anorectal manometry, (B) Rectal biopsy, (C) Lower G1 contrast study, (D) Trypsin estimation
Answer is C. C i.e. Lower GI contrast study Lower GI contrast study confirms the diagnosis & indicate the type of involvement, in cases of lower intestinal obstruction causing failure to pass meconium timelyQ.