Just a comment to say how much colonoscopies have improved with regard to patient care.
Back in 1979, when I had my first one - it was quite a horrific procedure throughout. Yes, we were given some medicine to clear us out in advance and told not to eat for the previous 24 hours. But when I got to the hospital (drove myself there), I was given an enema by a nurse, told to go into the nearby loo, and had to call in that nurse to check what I had passed - then a further enema and repeated that three times. Then, in gown - was sent to room for the procedure, no suggestion of any assistance or pain relief. At the end of that was just sent home (no drink or biccie, etc). I can remember sitting in my car feeling so unwell and just wanting to go home and to bed - which I was not able to do as at home there were pre-school children needing looking after.
Over the next ten years I was to have this procedure carried out on many occasions - slowly improving in how it was done.
My last time was just over ten years later, before I had a total Proctectomy. Much improved - none of that horrible getting nurse to check what was in toilet bowl, but still very unpleasant and still no tea and biscuits.