Hi Stacy! Glad to see you over here from the Facebook group. If all the testing was done at the vet's office, you can pretty much disregard it. Just like our blood pressure is higher at the doctor, our cat's glucose is higher at the vet.
I know from Facebook that your vet is recommending going from 1U of Lantus to 2U. That's too much of an increase for cats. We recommend raising dosing by 0.25 unit at a time unless the nadir (the lowest point in the cycle) is above 300. In that case, we raise by 0.5 unit.
Did your vet discuss home testing with you at all? There's no better way to know what's truly going on than to home test....and you don't need an expensive pet meter either. Most of us use a human meter like the Relion Premier Classic from WalMart. It's $9 and 100 strips are $17.88. A box of 25-28 gauge lancets are less than $2 so it doesn't cost a fortune.
Cats withstand high blood glucose numbers a lot better than humans do so while 500 is high, considering it was at the vet, some of that was stress-induced. It takes time for high numbers to do damage so as long as he's eating well and acting normally, it's not something you should be scared about. There are lots of people that can help you here.
If he were to start acting sick, hiding, refusing to eat, we'd be concerned about ketones so it's a good idea to have some urine ketone strips in the house just in case. They're about $6 for 50.
Here's some
information that will help us be able to help you better. If you need help setting up a spreadsheet once you're home testing, you can contact me on Facebook and I'll be happy to do it for you!
Welcome to the FDMB too! The best place you never wanted to be!