Diagnostic criteria for Impaired Glucose Tolerance (IGT), Impaired Fasting Glucose (IFG) and diabetes mellitus according to WHO (WHO, 1999b, WHO/IDF, 2006)
2 hour post glucose load (mmol/l plasma)
<7.8
≥ 7.8
and < 11.1
≥11.1
< 6.1
normal
IGT
diabetes
Fasting glucose (mmol/l plasma)
≥ 6.1
and < 7.0
IFG
≥ 7.0