There is a lack of international uniformity in the approach to the screening and diagnosis of gestational diabetes mellitus (GDM). The new diagnostic criteria by the International Association of Diabetes and Pregnancy Study Groups (IADPSG) based on data from the study of Hyperglycemia and Adverse Pregnancy Outcomes (HAPO) have created controversy because of the lack of clinical evidence of treatment benefit for mild GDM and the treatment effects on perinatal outcomes. The purpose of the present study is to know the efficacy of treatment to reduce adverse pregnancy outcomes in Mexican women diagnosed with GDM by IADPSG criteria.

Currently no evidence from randomized clinical trials on the efficacy of treatment of gestational diabetes mellitus (GDM), diagnosed by a single altered value during a 75g oral glucose tolerance test (75g OGTT), proposed by the International Association of Diabetes and Pregnancy Study Groups (IADPSG) to reduce adverse perinatal outcomes (APO). In our institution GDM diagnosis is established with two or more altered values during 75g OGTT, women with one altered value during OGTT are not considered GDM and therefore those women do not receive specific treatment for GDM. We conduct an open randomized clinical trial, two groups, Group 1 (women with treatment for GDM) and group 2 (women with routine care). The diagnosis of GDM will be perform with a single altered value during 75g OGTT: fasting ≥ 92mg / dL, 1-hour ≥ 180 mg / dL and 2-hours ≥ 153 mg / dL. Treatment consist of medical nutritional therapy (MNT), which includes restricted diet 45% carbohydrate, exercise and self-monitoring of glucose, if not reach therapeutic goals metformin and / or insulin will be added.

Inclusion Criteria:

• Singleton pregnancy between 18-30 week´s gestation

• 75-g oral glucose-tolerance test at 20-30 week´s gestation with only one altered value between: Fasting 92-99 mg/dL

  1. hour 180-211 mg/dL

  2. hour 153-177 mg/dL

     Exclusion Criteria:

• Pregestational diabetes (first diagnosed in pregnancy) defined by altered values during 75-g oral glucose-tolerance test above:

Fasting >126 mg/dL 2 hour >200 mg/dL

-Two or more altered values during oral glucose tolerance test above: Fasting 92 mg/dL

1. hour 180 mg/dL

2. hour 153 mg/dL

   • Multiple pregnancy
   • Active chronic systemic disease as hyperthyroidism, hearth, hepatic or renal disease, immunological disease as lupus and chronic hypertension