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Hi. Welcome. My name is***** I'm sorry to hear about Shemp's situation. AS far as the normal blood glucose levels for a cat, they are typically in the range of 90 to 130 mg/dl. The trouble with a spot check on a cat that goes into the clinic is that they can temporarily have their blood glucose levels spike and they have a stress hyperglycemia. So in cats, I typically don't get concerned unless the blood glucose is greater than 200. Screening a urine sample for glucose can help to rule out diabetes as if there is no glucose there, they aren't diabetic. I wouldn't consider insulin in Shemp at this time as it hasn't been proven that diabetes is there. Again, a urine sample can be used to help determine this. As far as the urination / defecation things, it sounds like there is some litter box aversion going on. What can be done for that is to make the litter box as appeasing as possible to use. I would make sure it isn't covered as this lets it air out better. I would scoop it daily. I would get one bigger that gives her more room in it to hopefully find a good spot in it.
That glucose test strips for the urine is definitely a good idea for owners to have to use at home. It wouldn't be very suspect to be a neurologic issue that is at the heart of this. Physically some can become less mobile and they can't get into the box as well. What you may do is make it where she can walk into it and not have to jump into it. It could still be a UTI that isn't sensitive to the clindamycin. The best way to totally rule that out is to do a urine culture on a sample obtained by a cystocentesis.