Table 1.

Diagnostic criteria for prediabetes

Authority, year	Venous plasma
WHO 1965	Postload: ~7.1–8.2mmol/L
WHO 1980	Fasting: <8.0mmol/L and 2-h postload: ≥8.0 and <11.0mmol/L
WHO 1985	Fasting: <7.8mmol/L and 2-h postload: ≥7.8 and <11.1mmol/L
WHO 1999 & 2006 (most recent)	IGT Fasting: <7.0mmol/L and 2-h postload: ≥7.8mmol/L and <11.1mmol/L IFG Fasting: ≥6.1 and <7.0mmol/L and 2-h postload: <7.8mmol/L (if measured) (2-h postload glucose measurement recommended to exclude diabetes or IGT).
ADA 1997	IGT Fasting: <7.0mmol/L and 2-h postload: ≥7.8mmol/L and <11.1mmol/L IFG Fasting: 6.1 – 6.9mmol/L
ADA 2003	IGT Fasting: <7.0mmol/L and 2-h postload: 7.8 – 11.0mmol/L (if measured) IFG Fasting: 5.6 – 6.9mmol/L (measurement of 2-h postload glucose not recommended)
ADA 2010 (most recent)	IGT Fasting: <7.0mmol/L and 2-h postload: 7.8 – 11.0mmol/L IFG Fasting: 5.6 – 6.9mmol/L (measurement of 2-h postload glucose not recommended) HbA1c (a new category of high risk for diabetes): 5.7 – 6.4%

Abbreviations: ADA, American Diabetes Association; A1c, Haemoglobin A1c; IFG, impaired fasting glucose; IGT, impaired glucose tolerance; WHO, World Health Organization.

One abnormal test result defines prediabetes, no repeat testing is required.