The IV fluids can often lower the BUN and Creatinine. It sometimes help to lower the phosphorus a bit, however, a Phosphorus of 16.1 is critical, and needs to be addressed immediately. You need to talk to your vet about putting her on a low phosphorus food, and adding phosphorus binders to it. Phosphorus binders will only work on the food that is ingested, to prevent the body from absorbing the phosphorus in the food. It doesn't do much for phosphorus that is already there. Phosphorus levels will decline once the body gets less phosphorus from the gut into the bloodstream. Here are some links about serum phosphorus levels, aluminum hydroxide gel phosphorus binders, the protocol for lowering serum phosphorus levels, and links to purchase Aluminum Hydroxide gel powder.
CRF Supply Page: http://members.verizon.net/~vze2r6qt...es/compare.htm
Phosphorus Binder Page: http://members.verizon.net/~vze2r6qt...es/binders.htm
This page has Dr. Nagode's protocol for phosphorus control, with dosages of ALOH powder. He is a Calcitriol and Veterinary renal failure researcher at Ohio State University. He recommends treating elevated phosphorus when ever it gets above 6.
I purchase my Aluminum Hydroxide gel powder from Thriving Pets.com http://www.thrivingpets.com/products...mStockId=749C2
Once you get her serum phosphorus under control, you should become familiar with Calcitriol as a treatment. Cleo has done amazingly well since starting it about 6 years ago, Pat & Alix has used it with a couple of her cats with good results, and so have several other members. Here's a link to the Calcitriol page. Calcitriol only works when the serum phosphorus is 6 or below. http://members.verizon.net/~vze2r6qt...iol/index.html
My vet did a telephone consult with Dr. Nagode, when I learned about Calcitiol, and wanted to try it for Cleo. She was so impressed with his data and protocol, that she not only put Cleo on Calcitriol, she also put her own CRF cat , Buddy, on it!