V, this is kind of related to your relating the bathroom issues for teachers. Although I finally started just leaving my kids for a couple of minutes to pee (easier in middle school and I always told the teacher next door), I recently had to do an all day urine collection test in preparation as part of preparatory lab work to get Reclast. I didn't want to give up a Sunday of riding or skiing, hiking, etc., so I did it on Thanksgiving day while I cooked, went for a short ride, and ate my dinner.
The endocrinologist called me personally, because she didn't believe that the sample I turned in was "right." She questioned if I had understood the directions to go in the collection bottle for 24 hours. I replied, that yes, I understood, but that after 30 years as a teacher and training myself not to have to pee too often, it's hard to change!
She believed me right away, after that and told me to double my water intake.