The magic phrase to search for is, “Euglycemic diabetic ketoacidosis” (“EDKA”). Here’s a review/summary/educational paper which has lots of links to original research:
Lack of insulin in IDDs (Insulin Dependent Diabetics; diabetics who require insulin) is almost invariably associated with high BG. This is particularly true because of the impaired glucagon response; IDDs with an impaired glucagon response (mostly T1s but some T2s) continuously produce glucagon (the impairment) and this causes the liver to continuously release glucose, raising BG if there is no insulin to cover it.
Summarizing the paper: EDKA is uncommon but significant (2.6% to 3.2%) in patients suffering from DKA. The summary of known causes comes right at the start:
Euglycemic diabetic ketoacidosis (EDKA) is an uncommon diabetic complication associated with several risk factors such as fasting, surgery, pregnancy, and now the use of sodium-glucose cotransporter 2 (SGLT2) inhibitors.
I fast periodically and I often combine that with exercise. I’ve also tried keto; it works quite well but it does raise blood ketone levels to quite significant values. The keto diet does this through ketosis not, under normal circumstances, ketoacidosis.
One paragraph from that paper struck me as particularly apposite here:
Often, insulin-using patients do not recognize their symptoms as DKA because serum glucose is not elevated, and they may maintain or decrease their insulin dose.[1] If insulin dosing is adequate for glucose levels, it prevents gluconeogenesis, resulting in euglycemia. EDKA can be considered a “partially treated DKA” in this setting.[9]
That alone is a justification for combining blood ketone measurements with blood glucose measurements. HOWEVER education, of both doctors and patients is clearly required, a lot of education.
Maybe the effect of SGLT2s will cause more research and more education. It seems sad that so little work was done before SGLT2s started producing EDKA as a side effect. I guess there’s more money in curing drugs than people.