This study assessed risk of adverse birth outcomes (ABO) associated with GDM by Carpenter-Coustan (C&C) and International Association of the Diabetes and Pregnancy Study Groups (IADPSG) with and without abnormal fasting at OGTT screening. Data included 355,506 singletons born in a single healthcare system. Data on demographics, maternal GDM status with or without abnormal fasting, and six ABOs [caesarean section (CS), shoulder dystocia (SD), fetal distress (FD), neonatal hypoglycemia (NH), preterm birth (PTB), and large-for gestational age (LGA)] were extracted from electronic medical records. Logistic regression was used to assess associations adjusting for covariates. In this cohort, 27,990 (7.9%) were diagnosed by C&C and 21,464 (6.0%) by IADPSG. In the C&C group, 37.3% had abnormal fasting (C&C_AF); among IADPSG, 23.3% met OGTT fasting thresholds (IADPSG_AF). Table 1 shows odds ratios (OR) of ABOs associated with GDM diagnostic types relative to no GDM. GDM by C&C or IADPSG with or without abnormal fasting was associated with higher odds of CS, PTB (except IADPSG_AF), and LGA (except C&C without abnormal fasting). IADPSG without abnormal fasting was associated with higher odds of SD and NH, and C&C_AF was associated with higher odds of SD but lower odds FD and NH. These data suggest GDM by IADPSG was associated with risk of some ABOs; this group may benefit from diabetes care in pregnancy to reduce risk of ABOs.
S.A.Carter: None. J.C.Lin: None. T.Chow: None. M.P.Martinez: None. R.Feldman: None. K.A.Page: None. A.Xiang: None.
