Fasting Required: Patient should be active and eat a regular diet that includes at least 150 grams of carbohydrate daily for three days prior to the test. Do not to eat or drink anything except water for at least eight hours and not more than 14 hours before the test. Please discontinue, whenever possible, all nonessential medication that can affect glucose metabolism at least three days before testing.
Specimen: Blood
Results: 1-2 Business Days
Description: The GTT (Glucose Tolerance Test) only establishes the presence of glucose intolerance. It is used in patients with borderline fasting and postprandial glucose to support or rule out the diagnosis of diabetes mellitus. Some use it in unexplained hypertriglyceridemia, neuropathy, impotence, diabetes-like renal diseases, retinopathy, reevaluation of prior diagnosis made under substandard conditions and with necrobiosis lipoidica diabeticorum.