The standard values of blood glucose in pregnant women: 1, fasting glucose measurement (FDG) FDG ≥5.1mmol/L can directly diagnose gestational diabetes mellitus (GDM), without the need to perform oral glucose tolerance test (OGTT); FDG <4.4mmol/L, the possibility of GDM is very small, can temporarily not OGTT. FDG ≥4.4mmol/L and <5.1mmol/ L should be performed as soon as possible OGTT. 2, oral glucose tolerance test (OGTT). 2.Oral glucose tolerance test (OGTT) is currently used in China to diagnose diabetes with OGTT of 75g of glucose. Diagnostic criteria:Fasting for at least 8 hours. The three blood glucose values should be lower than 5.1mmol/L, 10.0mmol/L, 8.5mmol/L (92mg/dL, 180mg/dL, 153mg/dL) respectively, and any one of the blood glucose values reaches or exceeds the above criteria can be diagnosed as GDM. GDM. Blood glucose monitoring three sugars and two weights. The three sugars are fasting blood glucose and 2 hours postprandial blood glucose, and preprandial glycated hemoglobin, and the two weights are to monitor the weight of the pregnant woman and the weight of the fetus.