How advanced is my 15-year-old cat's CKD and what diet is suitable?

Question

I hope to get like a 2nd opinion on my 15 y/o cat's blood works- the recent one includes SDMA. His hyperthyroid is under control (T4 is around 1.2). He is also on prednisolone (2.5 mg every other day). There is muscle atrophy in his hind legs ever since 5 years ago when I adopted him. How advanced is his CKD? Is there any evidence of nutrient deficiencies? His phosphorus levels are within normal range, does that mean his diet now is suitable for CKD? Thank you. Pet's info: Cat | Korat | Male | neutered | 15 years and 3 months old | 9.2 lbs

Dr. B. DVM, DACVIM (Oncology) · Accepted Answer

Unfortunately kidney values can not be interpreted without a urinalysis and specific gravity. Elevated BUN is not always CKD but this would be more likely in the face of poorly concentrated urine ( pred will also effect this). CKD is staged via what is called IRIS. This takes in to account creatinine, protein in the urine, and blood prressure. SDMA is newer and thought to be an earlier indicator then BUN/creatinine as these as insensitive markers of kidney function. This has now been incorporated in to the new IRIS scheme. What i would recommend for your kitty is a urinalysis and blood pressure to better stage. For early stage CKD kitties a renal diet is recommended. It is also important to treat any high blood preesure or significant protein in the urine as these can worsen kidney function. I hope this helps and thank you for using Petco Pet Education Center, formerly Petcoach!

How advanced is my 15-year-old cat's CKD and what diet is suitable?

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