The studies used to establish the "normal" ranges for BUN (blood urea nitrogen) in cats are based on cats that were not fed species-appropriate high-meat-protein diets. A cat on a healthy, high-meat-protein diet will often have levels that are somewhat higher - i.e, outside the so called "normal" range of laboratory results.
SO WHAT? If your cat's blood work comes back with a higher than "normal" BUN - and your cat is on a raw meat-based diet - make sure your vet accounts for this in using BUN as a definitive diagnostic marker for determining if your cat has kidney disease. Dr. Elizabeth Hodgkins notes, "[Veterinarians] need to be aware that some degree of elevation is normal in such patients and is not harmful."
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