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When a cat is given fluids for its kidneys does it change the blood test readings on the creatine and bun values. Or is it just that is hydrates the cat and flushes out the kidneys. I am asking because my cat had fluids last Tues. when the vet did the first blood test and the bun and creatine were elevated. On Friday, the cat's bloodwork was about the same and the vet made the statement the fluids didn't help. Please answer