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Objectives: The presence of fetal polycythemia in pregnant women with GDM maybe indicative of fetal hypoxia caused by maternal hyperglycemia. In order to find a method to evaluate the degree of fetal impairment in patients with GDM, this study compared MCA-PSV of this group with pregnant women without GDM. Methods: A cross-sectional study was performed. Data was collected before treatment of GDM. A total of 239 patients were included, 116 for the case group and 123 for the control group. The patients diagnosed with GDM according to ADA criteria are in the study group. The maternal data evaluated were: age, parity, BMI, gestational age at the time of the evaluation, glycemic profile and glycated hemoglobin (HbA1C). The evaluated fetal parameters were: abdominal circumference, weight, volume ofamniotic fluid, umbilical artery pulsatility index (UA-PI), middle cerebral artery pulsatility index (MCA-PI …