All pregnant women who performed an OGTT following Italian Guidelines and then delivered at our University Hospital from march 2020 to march 2021 were prospectively enrolled in this study. Primary outcome of the study was the number of women to whom was diagnosed GDM with only the fasting glucose value (≥ 92 mg/dl), following Italian Diabetes Societies recommendations for COVID 19 pandemic period. In the same time, we prospectively collected the data of women who became diabetic following the criteria of WHO 1999 (fast glucose value ≥ 120 mg/dl, 2 hours later ≥ 140 mg/dl) still in use in some large countries like India. From the clinical charts, we reported the distribution of risk factors for GDM (maternal age ≥ 35 years, family history for diabetes type 2, ethnia, BMI ≥ 25, previous GDM) and clinical outcomes such as hypertensive disorders, preterm birth, macrosomia, intrauterine growth restriction and Caesarean section in emergency.

These data will be compared between the 2 groups consisting in those diagnosed with only IADPSG criteria versus those diagnosed with only WHO '99 criteria.

Inclusion Criteria: Pregnant women who perform GDM screening -

Exclusion Criteria: Twin pregnancies

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All pregnant women who in a 12-month period perform GDM screening and then deliver at our University Hospital