How can we diagnose diabetes mellitus type 2?

Fasting Blood Glucose (if <100 normal, if 100-125 impaired fasting glucose (IFG) prediabetes, if >125 diabetic) 2h Plasma Glucose (if <140 normal, if 140-200 impaired glucose tolerance (IGT) prediabetes, if >200 diabetic) Random plasma glucose (if >200 diabetic- indeterminant if below)