Many pregnant mothers know that there is a Down’s syndrome screening, but also know that there is a “sugar screening”, but “sugar screening” is screening what, some people do not understand, the following by the author to bring you to understand the so-called “sugar screening” what the hell! What the hell is this so-called “sugar screening”! A. What is “sugar screening”? The 75 gram oral glucose test, or “OGTT” for short. The OGTT is done to diagnose gestational diabetes in pregnant mothers. Suitable time for the test: 24-28 weeks of pregnancy, and the first maternity check-up after 28 weeks. 2. Why can 0GTT diagnose gestational diabetes? In the middle and late stages of pregnancy, the anti-insulin substances in the pregnant mother’s body increase, making the pregnant mother less sensitive to insulin, so the insulin demand increases accordingly. When pregnant mothers with impaired insulin secretion consume a certain amount of glucose, the blood glucose concentration will rise sharply and cannot return to normal level in a short time like normal people. Therefore, pregnant mothers who have not been diagnosed with diabetes before and during early pregnancy should have OGTT. How to do OGTT? Requirements: 1. Eat normally and be physically active 3 days before the test, and consume not less than 150 grams of carbohydrates per day, not less on purpose for good results! 2, 1 day before the examination after dinner fasting for more than 8 hours. 3, at the latest, the examination should be started before 9:00 a.m. the next day after fasting. 4. During the examination, blood will first be drawn to measure fasting glucose in fasting state, and then the pregnant mother needs to drink 300ml of liquid containing 75g of glucose within 5 minutes. After that, blood will be drawn to measure the glucose level in 1 hour and 2 hours respectively. 5. Sitting still and abstaining from smoking during the examination. Diagnostic criteria of OGTT: Normal values: fasting blood glucose <5.1mmol/L; 1 hour blood glucose <10.0mmol/L; 2 hour blood glucose <8.5mmol/L. As long as one of them reaches or exceeds the standard value, it is glucose disease in pregnancy. V. Risk factors for gestational diabetes: pregnant mothers with the following conditions are at high risk: 1. the pregnant mother herself: age ≧ 35 years, overweight or obese before pregnancy, history of abnormal glucose tolerance, polycystic ovary syndrome; 2. family history: a close relative with diabetes; 3. history of pregnancy and delivery: unexplained stillbirth, stillbirth, fetal malformation, history of miscarriage, history of GDM and history of giant fetus and excessive amniotic fluid; 4. 4. current pregnancy: fetus larger than gestational age, excessive amniotic fluid, excessive weight gain, recurrent vulvovaginal fungal inflammatory disease. Note: Even if the first OGTT is normal in a high-risk pregnancy, the OGTT needs to be reviewed in late pregnancy if necessary. the OGTT test is a mandatory part of the maternity checkup for pregnant mothers, unless diabetes has been diagnosed before or early in pregnancy.