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Table 2 An overview of the diagnostic criteria of the OGTT used for GDM before 24 weeks of pregnancy and for GDM ≥ 24 weeks of pregnancy

From: Screening for pregestational and gestational diabetes in pregnancy: a survey of obstetrical centers in the northern part of Belgium

Diagnostic criteria GDM < 24 weeks GDM ≥ 24 weeks
  (n = 25) (n = 45)
75 g OGTT   
Carpenter & Coustan 20% (5) 9% (4)
WHO 0 2% (1)
IADPSG 28% (7) 33% (15)
100 g OGTT   
Carpenter & Coustan 48% (12) 52% (23)
NDDG 4% (1) 4% (2)
  1. GDM: gestational diabetes; OGTT: oral glucose tolerance test; WHO: World Health Association; IADPSG: International Association of Diabetes in Pregnancy Study Groups; NDDG: National Diabetes Data Group.