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Table 1 Screening and diagnosis of GDM in a one or two-step approach according to ADA

From: Historical facts of screening and diagnosing diabetes in pregnancy

SCREENING   
Single step OGTT 100 or 75g For average and high risk pregnant 24 th -28 th gestation weeks
Two steps OGCT 50g If 1-hour≥ 140 mg/dl Perform an OGTT 100g For all pregnant women 24 th -28 th gestation weeks
DIAGNOSIS OGTT 100g OGTT 75g
FASTING 95 mg/dl 95 mg/dl
1-hour 180 mg/dl 180 mg/dl
2-hours 155 mg/dl 155 mg/dl
3-hours 140 mg/dl -
  1. Criteria for GDM diagnosis= 2 altered values.
  2. 75 g OGTT does not include the 3-hour value.
  3. A carbohydrate-rich diet with more than 150 g/ day/ 3 days before the test.
  4. Patients should be seated and do not smoke during the test.