Doctor Checkup / Physical

What do they check for in pee in a routine checkup where they make you pee in a cup at the pediatrician office. My 11 year old brother had to pee in a cup to, like we always have done once every 2 years or so. Also they take a drop of blood.

Any drug testing? I got really nervous..

Who's Paying for physical? Doctor's don't work for free they will perform only what the are getting paid for.

My mom? OUr insurance?

Been going to the same doctor forever.. There's no way I'm going to ask my mom what its for..