Gestational diabetes is how classification?

A : asymptomatic, fasting glucose "7.2mmol / L oral glucose tolerance curve is not normal. Diet therapy can maintain normal blood sugar levels without having to use insulin therapy. Grade B : age "20-year-old course" 10, diabetic vascular disease. Grade C : age of onset in 10 ~ 19 years, with duration of 10 ~ 19, non-diabetic angiopathy. Grade D : age "10-year-old, or ≥ 20 course, accompanied by a very mild microangiopathy (such as background retinopathy). Class F : diabetic nephropathy. R-class : with proliferative retinopathy.