Left upper quadrant marking corresponds to which ostomy type?

• A. Transverse colostomy
• B. Sigmoid colostomy
• C. Ileostomy
• D. Urostomy

Answer: (A)

Stoma site marking reflects which segment of bowel is diverted to the abdomen. The location on the abdominal wall is chosen to align with the anatomy of the bowel segment being brought out.

The transverse colon sits across the upper abdomen, so bringing it to a surface in the left upper quadrant is the typical setup for a transverse colostomy. That’s why marking the left upper quadrant corresponds to this ostomy type. In contrast, a sigmoid colostomy is placed lower left, an ileostomy is usually on the right side or near the umbilicus, and a urostomy location depends on urinary diversion needs but is not typically in the left upper quadrant.