One of the best things you can do for your own self, and Surgeons Office is the following.
Invest in 2 pocket folders.
Every time you go to anyone get weighed, and get the print out.
make a copy for your own file, and turn one in, when it's time for surgery.
If they say "it's o.k., we have it all !" Then not a problem, but if they are missing anything !
They have it now.
You keep copy's of everything in one of those folders, just in case they ask for something later on.
Trust me,,, it does happen.
But you are right ! Keep close tabs on everything, after all, it's your surgery.