Preparation for colonoscopy is the most difficult part of a colonoscopy. It involves cleaning out the colon so that the doctor is able to visualize the colon itself during the procedure. Everything after the preparation is simple. Preparation is also the most important factor determining the “quality” of a colonoscopy.
If a person is not adequately “cleaned out” for colonoscopy, then it is more difficult to see abnormalities in the colon, and “things” can be missed. Things include polyps and even cancers.
Typical preparation for a colonoscopy includes (details may vary):
- A period of clear liquids (usually 24 hours before the study).
- It is important to drink lots of fluids during this liquid-only time.
- There is usually a large volume laxative or cathartic to drink, which will flush through the colon. People should have about 12-20 bowel movements as they drink the “prep solution.” Stools should look like slightly colored water, or urine, but the completion of the preparation.
- If stools are still thick / darkly colored / have debris, the patient should call doctor to describe preparation results. It may be necessary to take additional measures to insure a good prep and allow for a “high quality” colonoscopy.