How are oval stomas measured?

• A. Diameter of stoma
• B. Using the clock method for length and width
• C. Circumference of stoma
• D. Volume of stoma

Answer: (B)

Measuring an oval stoma requires capturing its two main dimensions—length and width—because an ellipse isn’t defined by a single diameter. The clock method provides both measurements in a familiar reference frame. Place a clock face on the stoma with 12 o’clock toward the top; measure the longest distance across the stoma from 12 to 6 for length, and the widest distance from 3 to 9 for width. This yields an opening size that fits the stoma without constriction. Diameters, circumferences, or volume do not reliably describe the shape or necessary opening for an oval stoma, especially since the stoma may be elongated or flatten with activity. The clock method reflects the actual shape on the body and guides proper appliance sizing.