I would take the advice of the specialist. Mild elevation is fairly common
in cats on lasix and also fairly common in older cats. The report seems to
stress that the kidney values are not high or dangerous and the lasix
isn't directly harming the kidneys. If lasix is needed to keep fluid off the
lungs, that is the priority, but I hope as she gets stable they would reduce
the lasix then when they feel it would be alright to do so.
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