A postprandial blood glucose of 7.8mmol/L is not serious and is normal for pregnant women. Gestational diabetes mellitus is the first occurrence of diabetes mellitus after pregnancy, when fasting blood glucose ≥ 5.1mmol / L or two hours after meal blood glucose ≥ 8.5mmol / L, can be diagnosed as gestational diabetes mellitus. Pregnant women with a postprandial blood glucose of 7.8 mmol/L should have an additional fasting blood glucose test to rule out gestational diabetes. Gestational diabetes mellitus will increase the incidence of spontaneous abortion in early pregnancy, easily complicated by gestational hypertension, reduce the resistance of pregnant women, easily combined with infections and many other adverse reactions; at the same time, it will increase the likelihood of fetal malformations, giant fetuses. If you find elevated blood glucose, you should go to the hospital for a comprehensive examination and early treatment of gestational diabetes to prevent the occurrence of many complications. During pregnancy, you should pay attention to rest, relax, avoid tension and anxiety, and go to the hospital in time if you have any discomfort, so that the doctor can make a clear diagnosis and cooperate with him/her in treating the symptoms.