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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.