It kind of sounds like this is what they are doing to him

On occasions your veterinary surgeon may want to collect urine directly from the bladder. This is most easily achieved by passing a needle into the bladder. It sounds a bit unpleasant but it’s surprising how well the majority of cats tolerate the procedure. The cat is positioned on its back or side and the skin in the area over the bladder is shaved and disinfected. A fine needle attached to a syringe is passed through the skin, into the abdomen and into the bladder. This method avoids the risk of the urine sample being contaminated.
http://www.catclinic.co.uk/health/urinesamp.htm

While I hate having to worry about cost, in all honesty I'm young and I don't really have a whole lot of money. Of course I will do whatever it takes. At least right now with what is going on the bill is still pretty low and I still do have some more money saved up should he need sir-jury.