How can doctors detect bleeding caused by diverticulitis?

Colonoscopy, Angio..: Diverticuli are small out pouches of the wall of the colon which are very prevalent in the us, occurring in as many as 1/3 people by age 60. Most people have no symptoms yet these diverticuli can rupture, leading to diverticulitis. They can also lead to bleeding, which is most easily detected by colonoscopy, a nuclear medicine "bleeding scan", or an angiogram.

Stool exam: Blood in or on the stool, can be detected by simple test. Passing blood is serious.