Am a retired (10 years) Physician in my day Diabetes Mellitus was defined as Fasting Blood Glucose mor than or equal to 7.0 mmol/l on 2 separate occasions more than 48 hours apart. Or random blood glucose more than or equal to 11 mmol/l with same time criteria. OR a presentation with Diabetic Keto Acidosis. HbA1c is a cheap and easy test that could be done in clinic with rapid result.