Thanks for the info. I'm not sure he ever did blood work. She had urinalysis and xray. Prescription food did desolve the crystals so keep your cat on it. I read you shouldn't mix with commercial food but eventually my cat refused it so I got a different prescription food and mixed in earthborn. Hope she feels better! It is scaryHeard back from the vet. Her kidney values are elevated. He wants to put her on a prescription food (Hills k/d) and recheck her values in 4-6 weeks. He also said to continue with the laxatone for hairballs; said that kidney disease can make them nauseated and maybe that's why she is having so many hairballs. Not sure how I feel about that--I feel that a lot of the hair ought to be moving through--but whatever. Also said we can give subcutaneous fluids as needed. I am not anxious to do that--been there, done that, with two other cats. I ordered the prescription food and just hope she likes it.