Cystocentesis, and it is the most sterile way to collect a urine sample. They insert a needle directly into the bladder and draw up some urine. It is not without risks though, which is why most vets stick with trying to get a sample the natural way.
I've used the same method as you to get a feline urine sample in clinic, minus the saran wrap. If all your vet is interested in is crystals then sterility isn't as big a deal.
Good Luck!
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