Answer: B - The nasogastric tube is removed after bowel sounds have been reestablished (generally around the third day) and after the client has passed flatus or stool. Choices A and C are incorrect because they do not include the return of bowel sounds. Before removal, the tube is frequently clamped for 2 to 4 hours - not 2 days (Choice D) - to test the client's tolerance. Gastric residue is measured after this period. If it is more than 100ml, the nasogastric tube is left in place. Likewise, if the client experiences any pain, nausea, vomiting, or distention during this period, the tube is left in. If no symptoms occur and there is minimal amount of gastric residue, the tube is removed.