The association between ABO blood groups and gestational diabetes mellitus: a retrospective population-based cohort study

Objective There is a lot of evidence that connects blood type to several diseases, including the development of diabetes mellitus type 2. The evidence for an association between ABO blood groups and the possibility of developing gestational diabetes mellitus (GDM) is scant and inconclusive. We aimed to examine the link between ABO blood group types and GDM by the use of a large population-based cohort of pregnant women. Study design A retrospective population-based cohort study was conducted using data collected from January 2013 to December 2017 from the Emek Medical Center, Afula, Israel. All pregnant women who underwent the two-step screening and diagnosed with GDM and delivered at >24 weeks were included. Women who had pre-gestational diabetes or whose pregnancies were terminated were excluded. The odds ratio (OR) were obtained through binary logistic regression analysis and the corresponding 95% confidence interval (CI) by the use of both the univariable and multivariable analysis. Results Of all 16,067 women included in the study cohort, 1712 (10.7%) had GDM. The incidence of GDM was 11.0%, 10.8%, 10.6%, and 8.8% in blood group A, B, O, and AB, respectively. After adjusting for maternal age, parity, and number of fetuses, AB blood group was associated with reduced risk for developing GDM compared to the other blood groups (p = .038; adjusted OR: 0.79; 95% CI: 0.64-0.99). There was no difference in Rhesus factor between GDM and controls. Conclusions Women with AB blood group have a lower risk for developing GDM compared to other blood group types.