The ADA revised the screening and diagnostic criteria for GDM in 2011: 1. In individuals with risk factors for diabetes mellitus, screen for undiagnosed T2DM according to diabetes mellitus diagnostic criteria at the first prenatal visit; 2. For pregnant women without confirmed diabetes mellitus, screen for GDM using the 75 g oralglucose tolerance test (OGTT) at 24-28 weeks of gestation. rest (OGTT) at 24-28 weeks of gestation to screen for GDM, with the diagnostic cut-off points being: fasting blood glucose ≥5.1 mmol/L or 1-hour blood glucose ≥10.0 mmol/L or 2-hour blood glucose ≥8.5 mmol/L, and a diagnosis of GDM can be made by meeting the glycemic value at any of these points. 3. Women with GDM should undergo diabetic screening at 6-12 weeks postpartum to determine whether diabetes is permanently present. 4. Women with a history of GDM should be screened for diabetes at least every 3 years to determine whether they have developed diabetes or prediabetes.