Most patients with gestational diabetes are asymptomatic, usually in mid-pregnancy, the test is 75g glucose tolerance test, which needs to be performed between 24-28 weeks of gestation, the specific requirements of this test are as follows: 1, fasting for more than 8h before the test, three days need to eat normally, avoid overeating or eating too much high-calorie food; 2, the test needs to drink 300ml of solution containing 75g glucose within 5min, and then 3. The blood glucose value before taking sugar water and 1h and 2h after taking sugar water will be taken for judgment, if the blood glucose value is >5.1 in fasting, >10 in 1h after taking sugar and >8.5 in 2h after taking sugar, gestational diabetes can be diagnosed.