My Tubby, who is 16 1/2 years old, has chronic kidney (renal) failure. He was diagnosed with it about 2 years ago now I think. One of the reasons I took him in was because he was throwing up all the time. He had always been a "thrower upper" so at first I wasn't that concerned, but when it got to be everyday, I knew I had to take him in.

The vet told me to start giving him a 1/4 of a Pepcid everyday. He said this wouldn't reverse any damage that had already been done, but it would delay any further decline. I guess one of the things the Pepcid does is increase the blood flow to the kidneys, making them work better. It also does the same for kitties as it does for humans - which is reducing the acid in the stomach, so he has an upset tummy less and therefore throws up less.

So after 6 months on the Pepcid, I took Tubby back for a check-up. The one "level" that was down, actually went back to the "normal" range, and the other "level" hadn't gotten any worse. So the Pepcid had actually improved his kidney functions. He had gained some weight back too because he wasn't throwing up all the time - and our carpets and floors had a reprieve from all the cleaning because he wasn't throwing up all the time.

The next 6 months his "levels" were the same as before, meaning he hadn't gotten any worse, and he had gained some more weight back, so he is doing good. He still throws up occassionally, but it's usually when I get over zealous with the treats. (bad mommy!) And at his last checkup the vet said "He's doing very well for a guy his age."

So it would be good to take Blue back for the blood work, and ask them about the Pepcid thing. I think somebody else on here once mentioned another medication that basically does the same thing but is made for kitties, so the vet might recommend that too.

Here are some websites to look into that give a lot of info on CRF (Chronic Renal Failure). Kidney Diesease in Cats On this first one, if you scroll down past the ads there is a lot of good information.
Merck Veterinary is also a good resource.

Good luck with Blue. He has done so well for being diagnosed so young. Hopefully these resources will help, and the vet can recommend some Pepcid or something to help Blue to be here for many years to come.

Please let us know how his vet appointment turns out, and what the vet recommends.

Hugs and smoochies to Blue and hugs to you too for being such a good kitty mommy and caring enough to keep Blue in the best of health.