Glycemic screening refers to the screening of gestational diabetes mellitus, and precautions include maintaining emotional stability during the test, fasting on the day of the test, and taking a light diet the day before the test. 1. Maintain emotional stability during the test: During the test, it is important to keep your body emotionally stable and avoid stressful fluctuations in blood glucose caused by anger, running, etc., so as to get accurate results. 2. Keep fasting on the day of the test: Fasting glucose measurement is required for glucose screening, so you need to keep fasting on the day of the test to prevent the test result from being affected. 3. Eat a light diet the day before the test: the day before the test, you need to eat a light diet, avoid eating too much greasy food, and also avoid dieting to prevent abnormal changes in insulin levels in the body. If a pregnant woman needs to undergo glucose screening, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, and if there are abnormalities, it is necessary to take a standardized method of intervention in a timely manner.