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Table 1 Plasma glucose values used as diagnostic criteria for gestational diabetes mellitus and pre-diabetes

From: Outcomes in the offspring of mothers with pre-diabetes during pregnancy: a protocol for a systematic review

  NDDG (1979)a C&C (1982)a WHO (2006)b
1 hr-GCT (50 g) at 24 to 28 weeks gestation ≥140 (7.8) ≥140 (7.8) 92 to 125 (5.1 to 6.9)
3 hr-OGTT
1 hr ≥190 ≥180 ≥180 (10)
2 hr ≥165 ≥155 153 to 199 (8.5 to 11)
3 hr ≥145 ≥140  
  1. Values are expressed in mg/dL (mmol/L). a100 g OGTT; b75 g OGTT. Gestational pre-diabetes is confirmed when there is an abnormal result in the GCT test and either normal or 1 abnormal OGTT test result [23,24]. If there are two or more abnormal values in the OGTT, the patient is diagnosed with GDM [14]. C&C, Carpenter and Coustan; GCT, glucose challenge test; NDDG, National Diabetes Data Group; OGTT, oral glucose tolerance test; WHO, World Health Organization.