And there was also Jersey, who regularly hung out in the 30's after she went OTJ.
The normal range that we use comes from the Rand/Roomp Tight Regulation Protocol document, which is specific to use with a long-lasting insulin, ie, Lantus and Levemir. They set the goal for a cat on insulin to be tightly regulated as 50-120, and say that this is the range that allows the pancreas to have the opportunity to heal, if at all possible. I think the idea is that this is specifically for a cat ON INSULIN, because there is a safety margin for us to be able to bring up the cat's blood sugar to prevent a hypo.
I think those sources you cited are probably comparing apples and oranges. No doubt the veterinary sites are using pet glucometers. Rand/Roomp used 68 Alpha Trak as the lower boundary as comparable to 50 on a human meter, but they don't mention an upper number for the normal range.
On the Main Health FDMB page they are dealing with lots of different insulins, and i think there are some different numbers used there. They have a no-shot # of 200, which makes sense when you're using an insulin like Vetsulin, for example, that onsets quickly. With lantus and Lev on this group we use 150 as the "ask for advice your first time" number. Those insulins aren't going to onset right away (on averagea about 2 hrs for Lantus and 4 hrs for Lev) and the preshot number is less important than the # you can predict (if you can) will be happening when the insulin onsets.
The specific part from
Tilly's Diabetes Page is below. It's not 100% blood sugar between 50-80, but "most cats" and "sporadic higher and lower BGs."
Phase 5: Remission
14 days without insulin and normal blood glucose values. Most remission cats are able to stay in the normal range all of the time (50 to 80 mg/dl), although there are a few cases of sporadic higher and lower BGs. Don't stop feeding low-carb and try to avoid cortisone if possible. Test the cat's BGs once per month.
Anyway, interesting discussion. I think the most important # for anyone using Lantus/Lev are the references for normal numbers suggested here, at least while the kitty is on insulin. Once they are off insulin, then the idea is a majority of the time under 100, all of the time under 120 is considered normal.