You said..."The vet did a blood test after the first visit and noticed elevated uric acid levels"...high levels of uric acid is a symptom of gout which involves the kidneys too....your vet should know if that's what's involved.
http://www.peteducation.com/article.cfm?cls=17&cat=1796&articleid=2496
http://www.peteducation.com/article.cfm?cls=17&cat=1796&articleid=3317
http://www.anapsid.org/diverskidney.html

Not sure if carnivore care is good or not in situations like this. You might want to look into the protein levels and ask your vet if s/he didn't tell you to use it. (I'm not a vet and am only mentioning this because one of the above sites says..."Any underlying dietary or environmental cause will need to be remedied. Diets such as Hill's Canine u/d, which are low in those proteins which are metabolized into uric acid, may be used in carnivorous reptiles."

Hope your dragon will be okay!