Yes. I had one done last year, just before having mucosal prolapse removed (which by the way didnt help). if you are chronically constipated, the markers or rings wont leave your body in 5 days. i was surprised that all three of my markers were by sitting just above the caecum obstructed by a lot of waste.
I have always 'gone' to the toilet every day and have done since myyouth, but apparently, i am chronically constipated?!! (does anyone get that?) i'm from london by t he way.