Three types of test are used to diagnose diabetes
- Fasting Plasma Glucose: <100mg/dl = normal , 100-126 mg/dl = prediabetes >126 mg/dl = Diabetes
- Impaired glucose tolerance: (taken 2 hours after oral glucose load) <140 mg/dl = normal 140-200 mg/dl = prediabetes >200mg/dl = Diabetes
- HbA1c (glycocylated hemoglobin): average value of blood sugar over a period of 3 months 4.5-5.5 = normal 5.6-6.5 = prediabetes >6.5 = diabetes HbA1c is now accepted as an independent diagnostic criteria for diabetes according to 2011 WHO guidelines.