Personally I would be surprised if there are many people out there who wouldn't get an elevated blood sugar reading two hours after ingesting 75g of pure glucose!
Yes it may well act as a test to indicate the development of Diabetes, but it has no bearing on your day to day functionality as a Diabetic. That is what the HbA1c is for.
Unless the HbA1c indicates that the Diabetes is dangerously uncontrolled, then diet should be the first port of call with another HbA1c taken three months later to see how well it is being controlled by that means.
I have parted company with my Diabetic 'Specialist' because quite frankly, I have lost faith in the man and have far more confidence in my own understanding of my own body and my own Diabetes.
Learn what you can about it all - the more you understand it, the more confidence you have to stand up for yourself.
You have come to the right place. The greatest benefit you can have is to follow a low-carb regime and ditching the extremely damaging gluten grain foods is by far the best thing you can do. Very few people out there realise the damage this awful stuff is doing to them. We all love bread, cakes and biscuits, but they don't love us.