After swallowing, the capsule travels like a piece of food through the stomach, small bowel and into the large bowel. It provides high-resolution images of the stomach and small intestine, taking two pictures every second for up to 11 hours, providing about 60,000 pictures in total.
Recording probes, taped on the abdomen, track the progress of the capsule. The images obtained by the capsule are transmitted to a data-recorder worn in a harness around the waist.
The most common indication is to look for reasons of iron deficiency anaemia which remains obscure despite gastroscopy and colonoscopy.