Main findings
In this prospective study of pregnant women, we specified the increasing trend of gestational TG and its decline after delivery. There was a tendency that overweight and obese women and women with GDM had higher serum TG throughout gestation and postpartum than normal women. Serum TG during pregnancy were positively associated with TG at 42 days postpartum. High gestational TG level increased the risk of postpartum hypertriglyceridemia, especially in early pregnancy. TG trend of change during pregnancy was positively associated with postpartum TG and risk of postpartum hypertriglyceridemia. TG level should be controlled under a threshold as 1.12, 1.93, 2.35 and 3.08 mmol/L at 6-8th, 16th, 24thand 36th gestational week, respectively. The association between gestational TG and increased risk of postpartum hypertriglyceridemia was more significant among pregnant women with normal pre-BMI and without GDM.