No you do not need to stop your miralax 👍to get your prolapsed stop eating the night before and called he's on early in the morning to do this test where you drink . You drink a white thing it looks tastes like bingo like 16 or 20 oz of the I need to drink it with in 15 minutes yum . They do an x-ray before you drink it and then they do one and they do a couple of x-rays then they said you on a big commode and then they put a syringe. in your rear end and fill it up and it feels like with this stuff. you are covered up with a gallon and they give you a blanket to sit and then you sit on a like a commode and then they watch you go to the bathroom as you go to the bathroom they click the machine and watch you go poop it mimics poop as they take X-rays have fun. no it was the most embarrassing thing for me it was embarrassing to watch them watch me go to the toilet. oh well it was no big deal for them they said they did it every day did for a day 5 days a week. and it checks if your poop's getting sick in the rear end or if there's a prolapse and what's going on or if the muscles are squeezing are not in the in the rectum or what's going on. 🥵 Hey at least it's painless and you don't need to go to sleep for it and you can walk out after you get done 😀. If you do it then left and yeah I told you what there is so hopefully there's no surprises.