Glucose tolerance generally refers to the oral glucose tolerance test, and the second oral glucose tolerance test review also requires sugar water. Oral glucose tolerance test is a glucose loading test to understand the body’s ability to regulate blood glucose and the function of pancreatic beta cells. Before performing the test, a certain amount of glucose needs to be taken orally, 75 grams of anhydrous glucose for adult patients and 1.75 grams per kilogram of body weight for pediatric patients, with the total amount not exceeding 75 grams. Sugar water is consumed within five minutes, blood is taken for the first time on an empty stomach, and then the clock is started from the first sip of sugar water, and then blood is drawn once every 30 minutes, one hour, two hours, and three hours thereafter. So, you need to drink sugar water even for oral glucose tolerance test review. Patients who need to do glucose tolerance test review should be under the supervision of a doctor.