Okay,
So I’m having a PET scan in the morning. Fine.
They want me to drink lots of water today and up until the time of the scan. (I think the exact wording was “as much as you can hold.”) Fine.
They’ll inject me with a radiopharmaceutical. Fine.
They’ll then restrict “movement, reading, or any other activity” for 90 to 150 minutes. (Reading’s an activity!?) After all that water? Not so fine.
But, hey, if this is what I’m worrying about, it should be fine.
Laurie White's Blog 
Ann Shen said
I hope that your bladder is bigger than mine. I had to drink one litre of water one hour before an ultrasound and I didn’t make it. 🙂