CGM during late pregnancy may help predict complications in women with type 1 diabetes. A retrospective analysis of 87 singleton pregnancies, published in the Journal of Diabetes Science and Technology, revealed that glucose trends from 24 to 39 weeks’ gestation were linked to adverse outcomes in 71% of participants.

Women who developed HDP showed a significantly higher mean glucose concentration and time above range, along with reduced time in range between 24 and 37 weeks (P < .05). The divergence in CGM metrics was most pronounced between 28 and 30 weeks, when insulin resistance typically peaks.

Those delivering large-for-gestational-age (LGA) infants had lower time below the range between 24 and 35 weeks, suggesting different glycemic dynamics influence fetal growth. CGM data from the late second to early third trimester may help identify pregnancies at higher risk for HDP or LGA. Detecting these trends early can support more timely and personalized management.