Researchers performed a retrospective study to compare rates of GDM and related outcomes between a group of women who had bariatric operations before pregnancy.

Women who delivered after bariatric operations were slightly older (32.5 years vs. 31.1 years, p < 0.001). The median time from surgical procedure to delivery was 19.6 months, which meant that the majority of women did not adhere to the current recommendation to defer pregnancy for two years after bariatric procedures were performed. Deliveries before bariatric operations occurred at a median time of 16.5 months, meaning that most women waited more than a year after delivery before having bariatric procedures. The majority of women in each group had a bypass procedure (75 percent in the prebariatric delivery group and 87 percent in the postbariatric delivery group). Women who had a prebariatric delivery were more likely to have an adjustable banding procedure than women with a postbariatric delivery (9 percent vs. 3 percent).

Source: Weber Shandwick Worldwide