From working in multiple veterinary practices, both small animal and exotic, one thing I have found is that a good vet will reach out to consult another if they don't know what to do themselves. If you could find a reptile vet or rescue in your state and at least have their phone number with you, your vet may be able to consult after the exam with someone more knowledgeable.
There was also a link on here somewhere for vets that have instructions on blood draw and what labs to use, I'm not sure if those labs are general for cultures or if it was a post about a specific disease. I saved the link, but not the post
http://labs.vetmed.ufl.edu
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