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Table 1 An overview of the screening tests used to screen for pregestational diabetes in early pregnancy, 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

Screening tests used Pregestational diabetes (n = 37) GDM < 24 weeks (n = 25) GDM ≥ 24 weeks (n = 45)
FPG 35% (13) 32% (8) 0
HbA1c 14% (5) 4% (1) 2% (1)
Random glycaemia 35% (13) 28% (7) 0
Glycosuria 30% (11) 4% (1) 0
Combination of tests 14% (5) 52% (13) 9% (4)
Combination of GCT and OGTT    
   ≥ 130 mg/dl 0 8% (2) 16% (7)
   ≥ 140 mg/dl 0 40% (10) 64% (29)
One-step OGTT    
   75 g 0 24% (6) 27% (12)
   100 g 0 12% (3) 0
  1. GDM: gestational diabetes; FPG: fasting plasma glucose; GCT: 50 g glucose challenge test; OGTT: oral glucose tolerance test.