- Objective - To determine whether blood glucose values of over 200 mg/dL in the oral glucose tolerance test (OGTT) are associated with pregnancy complications and adverse perinatal outcomes in patients with gestational diabetes mellitus (GDM). Methods - A retrospective cohort study was performed comparing patients with GDM A1 (diet controlled) that had at least one value of 200 mg/dL or higher in the OGTT, to those who did not. Patients were treated at the diabetes day care clinic of a tertiary medical center between the years 1999 and 2010. Data were available from the computerized perinatal databases. Results - During the study period, 803 women with GDM were treated at the diabetes day care clinic. Of these, 176 had at least one test value of 200 mg/dL or greater. No significant differences regarding maternal and perinatal complications such as polyhydramnios, macrosomia (birth-weight above 4 Kg), shoulder dystocia, low Apgar scores at 5 minutes (<7) and cesarean section were noted between the groups. Conclusions- A value of 200 mg/dL or more in the OGTT is not an indicator of perinatal complications.