If you don’t have to do a glucose tolerance test DON’T.
I went to one unsuspecting, and the bad part was, that I probably had bad enough fasting blood sugars in a year’s set of tests, to warrant skipping that.
So I tell people all the time, I “flunked” the glucose tolerance test, and that I didn’t … that is didn’t tolerate glucose.
And see if you can find a lab that can process the blood immediately. I didn’t get any treatment until the next Monday and even then we didn’t know how bad off I was.