Been there... done that.
My PT had a thick towel on the bed & just assumes that patients will leak on it. What else would they expect?
What she didn't expect was me peeing all over the floor as I got *off* the bed.
She wasn't fussed. "Oh yeah... the paper towels are over there".
I wiped it up & off I went. She didn't care. Another day at the office.

I'll be doing a repeat performance when my next surgeon does an assessment for an AUS.
Get on the bed, Pete. You sure? lol