2-Hour Glucose Tolerance Test with LabCorp
What Is a 2-Hour Glucose Tolerance Test?
The 2-hour glucose tolerance test is used to determine how well a person's body processes glucose. Glucose is the sugar the body uses for energy. This test is designed to measure how glucose is processed over a period of time by measuring fasting glucose levels as well as levels several hours after ingesting a glucose solution. This type of testing is typically done to aid in the diagnosis of type 2 diabetes.
A glucose tolerance test is typically ordered when someone is believed to be at risk for diabetes. For a more thorough test which includes measurements for 4 separate blood draws, customers may order a 3-hour glucose tolerance test.
Turnaround for the 2-hour glucose tolerance test is typically 1-2 business days.
Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
People taking this test should be active and eat a regular diet that includes at least 150 grams of carbohydrate daily for three days prior to the test.
Fasting should be observed prior to collection for 8-14 hours.
It is advised to discontinue, whenever possible, all nonessential medication that can affect glucose metabolism at least three days before testing. Please consult your doctor regarding any medications and how they may affect this test.
The Glucose Tolerance Test is collected as 2 specimens, fasting and 2 hours after drinking a glucose solution at the lab. Please ensure to schedule at least 2 hours of time for your collection.