How are round stomas measured?

• A. Height only
• B. Width or total diameter
• C. Depth measurement
• D. Circumference only

Answer: (B)

The key idea is that round stomas are sized by the opening’s width or total diameter. Measuring the external diameter gives a direct, practical indication of how large the appliance opening needs to be to fit around the stoma without constricting it or leaving gaps that could irritate the skin. Height or depth isn’t relevant because the stoma sits at or above the skin surface, not extending inward to a measured depth. Circumference isn’t the best choice here because it’s derived from the diameter and doesn’t provide the simplest, most precise way to determine the required opening size for a round stoma. In practice, clinicians use a circle gauge or template to measure the maximum external diameter and cut the flange opening accordingly, often allowing a bit of extra space to accommodate swelling or size changes over time.