An ostomy in which colon sections can begin producing regulated evacuation?

• A. Transverse colon
• B. Cecum
• C. Descending and sigmoid colostomy
• D. Ascending colon

Answer: (C)

Regulated evacuation is most feasible when the ostomy comes from the distal part of the colon. The descending and sigmoid colon have already absorbed much of the water and formed the stool, so the output is typically more formed and predictable. That makes it possible to schedule or regulate evacuation, often with methods like colostomy irrigation or a planned bowel program. In contrast, ostomies from the cecum or ascending colon produce liquid or semi-liquid output that is harder to regulate, and a transverse-colon ostomy tends to be less predictable than a distal-colon one. So the descending and sigmoid colon is the site where regulated evacuation can begin.