I have to go for a tummy and pelvic scan next week but there is no way on earth I can drink the required amount and not go to the loo for 1 1/2 hours. Last time I only had the pelvic scan and that did not require it. I can barely last 1/2 hour, and when I need to go I cannot hold it. Do I ring them and explain? Or go with an empty bladder and the procedure cannot be done correctly?