The difference between the two is: 1. The purpose of the test is different: sugar screening is to test the blood sugar status of pregnant women and to detect diabetes, while glucose tolerance is to further confirm the diagnosis of gestational diabetes; 2. The glucose tolerance is first fasting blood test blood glucose, measured after drinking 75g of glucose powder, in 1 hour, 2 hours, 3 hours, respectively, then draw blood test, that is, glucose screening need to draw blood twice, while glucose tolerance need to draw blood 4 times; 3, the test object is different: glucose screening is more basic than glucose tolerance diabetes screening, generally there are 5 kinds of pregnant women need to do glucose screening, that is, 35 years of age or older pregnant women, and weight or obese, and also accompanied by hypertension. Pregnant women with high blood pressure, pregnant women with a family history of diabetes, pregnant women who have given birth to a large child, pregnant women who have had positive diabetes before or during early pregnancy, and pregnant women who have had a history of fetal abortion. The glucose tolerance test is a further test for pregnant women with abnormal glucose screening results, i.e., those with blood glucose over 7.8 mmol/L. Whether a pregnant woman is having glucose screening or a glucose tolerance test, it would be better if she can take a walk around the neighborhood after drinking glucose. Remember to always follow the prescribed time to have your blood drawn for the test after drinking sugar, either too early or too late will affect the accuracy of the test results. If you are diagnosed with diabetes, you should follow your doctor’s recommendations for treatment.