1. The circumference of the abdomen, usually measured at the umbilicus (belly button).
2. The measurement of the distance around the abdomen at a specific point, usually at the level of the belly button (navel).

Measuring abdominal girth is used to diagnose and monitor:

• Obesity or the build up of fluid in the abdomen, often caused by liver failure or heart failure.
• Buildup of intestinal gas, usually caused by the blockage or an obstruction in the intestines.