When I had a glucose tolerance test during pregnancy I was told to fast from midnight the night before, I was told to only drink water and nothing else, hope that helps!
A common test to diagnose hypoglycemia is the extended oral glucose tolerance test.
The standard test is a 3 hour GTT (glucose tolerance test).
Chemistry
The glucose tolerance test is a lab test to check how your body breaks down sugar.
Only your doctor can advise you of whether you should take or skip your antidepressant anti-anxiety meds before a glucose tolerance test. You have to fast for eight hours prior to the test so it has to be done early in the morning. You can always just hold off on the medication until the test is finished.
It is generally recommended to fast for 8-12 hours before a glucose tolerance test, so it is best to avoid consuming anything, including water, during this fasting period. Water may dilute the glucose solution and affect the accuracy of the test results.
during the third triamester
Blood samples are taken from a vein before and after a patient drinks a thick, sweet syrup of glucose and other sugars
A1c
A gray tube is typically used for a glucose tolerance test. This tube contains sodium fluoride as an additive to preserve glucose levels in the blood sample.
The tube used to test for glucose tolerance is typically a gray-top tube. This tube contains a preservative that helps prevent changes in glucose levels after the blood is drawn, ensuring accurate test results.
There are many factors that influence this. They include what you have eaten the night before, how you are feeling that day, and how you react to the drink.