Doctors can be a bit different too, I think.
I had knee surgery in October and had a test the morning of - I was at 7.2mmol. Doctor was concerned it was a bit high, but said it would be fine to proceed.
Earlier this year, I had endoscopy where I was sedated. Again, they tested the morning of and o was at 5.6. I was elated. But the doctor insisted on giving me a small shot of glucose because he wanted his diabetic patients at least at 7 before proceeding.
It was weird to hear that, but I just had to shrug.
I should mention I was not on insulin at either times.
Just as a side note, there's been so many times I was hooked up to an iv to be given meds and I noticed I was also hooked up to a glucose saline drip. I quickly had to put a stop to that. Hospitals are hectic, I know, but how about simply reading my chart and seeing that I'm diabetic?