My GTT after 2 hours was 154 and I was told I was in a pre-diabetic state.
Here is a website I found that might answer your questions:
http://www.labtestsonline.org/unders...cose/test.html
I would talk to your Dr and see if he wants to run an HbA1c. That is a blood test that measures an average over about 3 months.
I agree with what JanelleMarie is saying. I too was referred to a dietician.
Good Luck