You do hope they use the CGM to read your BG levels. I didn’t have one a few years ago when I went through surgery and the first surgery was short, less than 30 minutes, but I came awake in the 70’s in recovery.
The second time I reduced my basal in half and was going to be in surgery for about 3 hours. So a little more concerned about my levels. I asked the anesthesiologist how often they check and he replied usually just when they first start. I told him I had dropped the week before and could he check my Bg level half way through and he agreed. This was a teaching hospital and pretty well known. That was scary. I ended up coming out of surgery at about 150…
From having discussions with other people, hospital care of Bg levels can really vary.
There is some discussions about using pumps on this thread.