Liz Buchanan BVSc MRCVS
Keymaster
Hello - and what a puzzle. The signs are drinking a lot and a positive skin tent (sometimes suggesting dehydration) despite blood glucose, kidneys, liver etc looking normal on the bloods. There have been neurological signs which can be associated with salt imbalance, present or possibly historical, although from what you sat the salt balance is currently under control. My first step in such cases is usually to test whether the pet can concentrate their urine or not, but this is basic; it sounds as though your vet feels as though they've done everything they can regarding diagnosis and you and they have resorted to monitor and see how things progress. You ask what else you can do.
Obviously, I am not your vet and not qualified to give you (or you vet) clinical advice but I can explain some general considerations. In general, cats that are dehydrated have a high red blood cell count (less fluid in the blood, the %age of red blood cells : fluid around them would go up) - however, this particularly value is only credible when measured by hand using a haematocrit tube, rather than by blood machine.
There is a disease called 'psycogenic polydipsia' which involves drinking for the sake of it due to possible brain pathology; however I have never seen a case and think that this label may sometimes be overused when the cause is difficult to identify. Causes of PUPD that need to be ruled out may include cancer (as far as possible - no-one can stand in front of an animal and tell you that it definitely doesn't have cancer), Addisons Disease and Cushings disease (rare in cats, but I have seen it).
Generally, if a vet cannot figure out the next step, it pays to refer upwards to a specialist in the field (in the UK we might say a 'medical specialist'), who can give them more guidance. There are kidney imalances, for instance, that don't present with the normal pattern. I wouldn't expect a cat to drink a lot when they are normal , so while yours appears to be healthy on the outside, it may be a good window for specialists to search more thoroughly for underlying disease.
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