If you have PCOS and you're getting ready to have an oral glucose tolerance test, you may be wondering how to prepare for the test and what. Glucose tolerance test — Overview covers definition, preparation, results of this diabetes blood test. The oral glucose tolerance test (OGTT) measures the body's ability to use a type of sugar, called glucose, To prepare for the glucose tolerance diagnostic test. How To Prepare Glucose tolerance diagnostic test To prepare for the glucose tolerance diagnostic test: The OGTT involves fasting overnight and then having your blood checked early in the morning. ONE-STEP TESTING You need to go to the lab one time for a 2-hour glucose tolerance test. The lab technician will tell you to drink the glucose drink. Diabetes Diabetes in Children and Teens Diabetes Type 1 Prediabetes. You will have blood drawn before you drink the liquid, and again 2 more times every 60 minutes after you drink it. Should I avoid sweet fruits? Your meals should be balanced with plenty of carbohydrates. It is best to drink the liquid quickly. Some people feel sick after drinking the glucose liquid and may vomit. The lab will usually send your results to your health care provider within a few days. The oral glucose tolerance test OGTT measures the body's ability to use a type of sugar, called glucose, that is the body's main source of energy. The Diabetes Forum - find support, ask questions and share your experiences with , people. Reprint Permissions A single copy of these materials may be reprinted for noncommercial personal use only. Dalkin, MD - Endocrinology. Join the Diabetes Forum Join the Newsletter. Symptoms of low blood glucose include weakness , hunger , sweating , and feeling nervous or restless. Gestational diabetes can cause pregnancy complications, so early detection and prompt treatment are important. What Affects the Test Reasons you may not be able to have the test or why the results may not be helpful include: Blood glucose ranges Download a free chart of the IDF recommended blood glucose ranges. The GTT Glucose Tolerance Test is of limited value in the diagnosis of reactive hypoglycemia, since 1 normal levels do not preclude the diagnosis, 2 abnormal levels do not prove that the patient's other symptoms are related to a demonstrated atypical OGTT, and 3 many people without symptoms of reactive hypoglycemia may have the late low glucose. Related MedlinePlus Health Topics. A glucose tolerance test can also be used. Diabetic diet Anti-diabetic drugs Insulin therapy intensive conventional pulsatile Cure Embryonic stem cells Artificial pancreas Other Gastric bypass surgery. Doctors use standard glucose values to diagnose prediabetes, diabetes, and gestational diabetes. Filter recipes by carbs, calories and time to cook.