Glucose tolerance generally refers to a glucose tolerance test. Drinking seven and a half sticks of glucose for a glucose tolerance test is generally an insufficient amount of glucose and may affect the accuracy of the measurement. To perform an oral glucose tolerance test you generally take 20 ml of 50% glucose, and adults should drink eight 20 ml of 50% glucose, so drinking only seven and a half 20 ml of 50% glucose is not enough and may affect the accuracy of the test results. In addition to this, you need to fast for eight to ten hours before the oral glucose tolerance test and the glucose should be drunk within five minutes. Patients who need to undergo an oral glucose tolerance test should standardize the process of the test and are advised to visit a hospital if they have abnormal results.