Glucose tolerance is short for oral glucose tolerance test. Oral glucose tolerance test is the gold standard for diagnosing diabetes and is also used in the diagnosis of gestational diabetes. You are able to drink normally the night before the glucose tolerance test. The methods and precautions for the glucose tolerance test include the following points. I. Three days before the oral glucose tolerance test, you should eat normally. Second, stop using drugs that affect blood sugar, such as glucocorticoids, before the test. Third, on the day of the oral glucose tolerance test, do not eat carbohydrates and sugary drinks, etc. for at least 8 hours, and water does not contain calories, and you can drink water normally before and during the test. IV. On the day of the oral glucose tolerance test, after drawing venous blood on an empty stomach, 75g of glucose was taken orally, starting from the first sip of sugar water, and then 1 hour and 2 hours after taking the sugar, venous blood was drawn to measure blood glucose respectively. V. During the test, you can walk around normally, and a lot of activities are not recommended.