OBJECTIVE To investigate the relationship between abnormal glucose tolerance during pregnancy and maternal-fetal outcomes, after categorizing women into groups with different levels of gestational abnormal glucose tolerance. METHODS A total of 1858 pregnant women who received two-step screening for gestational diabetes mellitus (GDM) at Fooyin University Hospital were categorized into four groups, according to their glucose abnormalities, and their maternal-fetal outcomes were investigated from October 2015 to June 2020. RESULTS Among the groups having different levels of abnormal glucose tolerance, there were significant differences and trends in mother's age, currently married status, and prepregnancy overweight or obesity, incidences of cesarean section, preterm, and gestational hypertension or preeclampsia; and with respect to neonatal incidence of large for gestational age (LGA), average weight, and average height (p < 0.05). After adjusting for potential factors, there were higher incidences of cesarean section (AOR = 1.71; 95% confidence interval [CI]: 1.12-2.61), preterm (AOR = 2.20; 95% CI: 1.23-3.91), neonatal LGA (AOR = 4.94; 95% CI: 2.87-8.51), and neonatal intensive care unit (NICU) admission (AOR = 2.66; 95% CI: 1.14-6.24) in the GDM group, relative to the control group. Furthermore, the women in the oral glucose tolerance test (OGTT)-1 group had a higher incidence of neonatal LGA when compared with the women in the normal group (AOR = 2.31; 95% CI: 1.02-5.33). CONCLUSIONS We found higher incidences of cesarean section, preterm, and neonatal LGA and NICU admission in the GDM women, and a higher incidence of neonatal LGA in the OGTT-1 group, relative to control group.