Interpretation of Blood Sugar Levels for diagnosis of Diabetes

Interpretation of Blood Sugar (Glucose) levels and Diagnosis of Diabetes: 

1) Diabetes symptoms (e.g. polyuria, polydipsia and unexplained weight loss for Type 1) plus:

• a random venous plasma glucose concentration ≥ 11.1 mmol/l (200 mg/dl) or
• a fasting plasma glucose concentration ≥ 7.0 mmol/l (126 mg/dl) (whole blood ≥ 6.1 mmol/l) or
• two hour plasma glucose concentration ≥ 11.1 mmol/l (200 mg/dl) two hours after 75g anhydrous glucose in an oral glucose tolerance test (OGTT).

2) With no symptoms diagnosis should not be based on a single glucose determination but requires confirmatory plasma venous determination. At least one additional glucose test result on another day with a value in the diabetic range is essential, either fasting, from a random sample or from the two hour post glucose load. If the fasting random values are not diagnostic the two hour value should be used.

(the diagnostic criteria published by the WHO in 2006: "definition and diagnosis of diabetes mellitus and intermediate hyperglycaemia".)