Screening test with 50-g GCT was offered at their first visit and those with abnormal results (> 140 mg/dl) were confirmed with the diagnosis of GDM with 100-g OGTT.
Diagnosis of GDM requires that at least two of four glucose levels of the100-g OGTT meet or exceed the upper limit of normal. The cut off values for fasting 1, 2 and 3 hours blood glucose were > 105, 190, 165, and 145 mg/dl respectively If GDM was not diagnosed, all the women were retested between 28-32 weeks using the same methods as the first visit