This is a disgusting topic, but ever so crucial to our health! We all need to heed our doctor's advice and have one after age 50.
I recently had one, and learned something very important from the nurses! To have one, you have to drink a gallon (16 cups) of the nastiest stuff in the world! I thought I'd throw it up, more than once.

The test itself is a cake walk. However, when I got to the hospital and talked with the nurses they asked me how it went, drinking the junk.

I told them how awful it was, and here comes the great advice: don't opt for the gallon of stuff to drink. The nurses told me that there is another option that you can request, where you have to fast a bit longer, but only have to drink one glass of something nasty! After having the other way, I can only say plan B is the way to go!!!!!