Unregistered

Please do drink a lot of water after your scan. FDG is taken up by your cells, but it is then metabolized and excreted. If you ask to look at your scan after it is taken, you will see a "hot spot" where the bladder is, if urine has collected there.

The woman who was adamant about not letting another person in with you was probably being overzealous. Like the person earlier said, you must weigh the risk against the benefit.

Good luck! Ask your facility; they probably have a radiation safety officer (as I am) who can help answer your questions.