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From Jan. 1985 to Jun. 1990, 2561 pregnant women attending our prenatal clinic were screened for gestational diabetes. A 50-gm, 1-hour glucose challenge test was given and 470 patients (18.4%) showed plasma glucose values greater than or equal to 140 mg/dl. These women were subjected to a further 3-hr 100-gm OGTT to diagnose diabetes using O'Sullivans' criteria. Of these 470 cases, 80 (3.1%) of total cases were shown to be diabetic. Strict glycemic control with a fasting plasma sugar under 105 mg/dl and postprandial sugar under 120 mg/dl was conducted using diet and insulin in all cases. We compared the perinatal outcome of GDM pregnant women with normal pregnant women. Statistically, there was no significant difference. This study clearly demonstrates that a GDM screening program should be recommended for every pregnant woman. Prompt glycemic control should be given for all diabetic mothers to optimize the perinatal outcome.