The standard practice here is for what is called "twilight anesthesia " that makes you feel sleepy but allows you to respond to questions being asked by the medical team in the room. For those that have not had a scope, remember that the pre op bowel cleaning liquid process MUST be followed properly, or the scope results will result in poor images. The bowel liquid lavage has to be drunk during the day/evening before the procedure, to fully flush out ALL the feces in the entire digestive tract. You will be spending a lot of time sitting on the toilet passing liquid feces.
Do not drink any liquid that is red or orange during the bowel prep period, because it could be seen as being blood in the bowel system. The instructions on the bowel lavage plastic jug will tell you exactly what to do, and more importantly what NOT to do in order to get the best results during your scope procedure. You will be drinking about 4 quarts of the bowel flush liquid over a 12 hour period of time, to get a squeeky clean lower bowel tract.
How do I know all this ? About 5 scopes over a 5 year period of time, due to chronic bowel flare ups. My most recent scope used a new procedure, a much less invasive process with a CT scan combined with an inflation of the lower bowel using a short 4 inch tube inserted into the rectum. The lower bowel is gently inflated with an inert gas, while the CT scanner records the views of the lower bowel. Takes about 15 minutes and the visual results are better than the traditional methods. Ask your Gastro M.D if that new procedure is appropriate for yourself ? Jimb.