Gestational diabetes mellitus (GDM) complicates 5 to 30 % of pregnancies. GDM is defined as hyperglycemia with onset or first recognition during pregnancy. Because it is a forerunner of type 2 diabetes mellitus (T2DM), professional associations recommend T2DM postpartum screening (T2DM-pPS) at 6 weeks/6 months post delivery, using a 75g oral glucose tolerance test (OGTT).

However, less than a quarter of these women are screened. This recommendation has failed for multiple reasons; the most important being that busy new mothers must deal with the major inconveniences of returning to a sampling center for a 2h testing session, bringing baby along or paying for a sitter, transportation, parking… A mother-friendly solution is direly needed.

The investigators hypothesize that, in these women, results of an OGTT performed after delivery on the last day of their hospital stay (OGTT-1) will predict results of the recommended OGTT (OGTT-2) at 6 weeks/6 months postpartum.

The main aim of our project is to determine the optimal cut-off value for the 2h glucose result during OGTT-1 in order to predict abnormal glucose tolerance status at OGTT-2 (the gold standard), in the same woman.

Inclusion Criteria:

• Women aged between 18 and 45 years;
• Having a positive diagnosis of gestational diabetes mellitus (IADPSG criteria);
• Treated with diet or insulin;
• Have given birth to a child at term; gestational age > 37 weeks;
• Have been followed during her pregnancy by a physician who delivers in CHUS;
• Have signed the consent form.

Exclusion Criteria:

• History of glucose intolerance or diabetes before the pregnancy;

• Have presented another obstetrical pathology during the pregnancy;

  • Severe gestational high blood pressure with proteinuria;
  • Delayed intrauterine development syndrome;
  • Pregnancy with more than a foetus;
  • Drug addiction;
  • Had complications during the delivery such as:

• Moderate to severe postpartum bleeding;

• Surgery in postpartum (curettage, hysterectomy, etc.).