A new born child has not passed meconium for 48 hours. What is the diagnostic procedure of choice?: (A) USG, (B) Contrast enema, (C) CT, (D) MRI
Answer is B. Failure to pass meconium in the first 2 days of life (48 hours) is typically suggestive of a lower GI tract obstruction such as Hirschsprung's diseases, meconium plug syndrome or anorectal malformation. A contrast enema is the most suitable primary investigation to make the diagnosis, amongst the options provided.