Colonoscopy has been done for many years, with good results. It is effective for finding problems with the lower digestive tract. However, it is possible that abnormal growths can be missed. This could be because the bowel prep was not done well or because of the placement and size of the growth. This is one reason why it is very important to tell your healthcare provider about any symptoms you may have after the colonoscopy. Bleeding and puncture of the colon (perforation) are possible complications of colonoscopy, but such complications are uncommon.
(Click Colonoscopy Risks for more information.)
It takes about 30 to 60 minutes to perform a colonoscopy. The sedative and pain medicine should keep you from feeling much discomfort during the exam. You will need to remain at the colonoscopy facility for 1 to 2 hours until the sedative wears off.