I am just going to ease my two pennies in here.
My Hba1c at my misdiagnosis was well higher than that, at subsequent test of my hba1c, it was high diabetic levels. Therefore the misdiagnosis!
It wasn't until I saw a specialist and at roughly the same time, I start low carbing, that my blood glucose levels (fasting) be at normal and my Hba1c became normal.
I was only referred because of having a hypo directly in my GPs office, she couldn't explain it, why hypo when my blood glucose levels and hba1c were high and I wasn't on other diabetic meds except metformin.
If you want to judge a diagnosis and prognosis of what happens then a prolonged OGTT is the only way to discount hypoglycaemia. Especially Reactive Hypoglycaemia!
It's what happens after digestion and when the bloods should normalize to normal levels.
The reason I suggested RH is because I recognized and remembered the symptoms!