Table 2 Diagnostic plasma glucose levels for the diagnosis of IFG, IGT and diabetes mellitus (from Engelau et al52)
FPG (mmol/l)2hPG in a 75 g OGTT (mmol/l)
IFG6.1–6.9NA
IFG (isolated)6.1–6.9and<7.8
IGT (isolated)<6.1and7.8–11.0
IFG and IGT6.1–6.9and7.8–11.0
Diabetes⩾7.0or⩾11.1

  • 2hPG, 2-hour plasma glucose; FPG, fasting plasma glucose; IFG, impaired fasting glucose; IGT, impaired glucose tolerance; NA, not applicable; OGTT, oral glucose tolerance test; PG, plasma glucose.