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Glucose Tolerance Test (GTT), Two-hour (Oral WHO Protocol)
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Glucose Tolerance Test (GTT), Two-hour (Oral WHO Protocol)
Access Labcorp Draw · Access Medical LabsCatalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.
What this laboratory test evaluates
DetailsThe Glucose Tolerance Test (GTT), Two-hour (Oral WHO Protocol) evaluates the body's ability to metabolize glucose by measuring blood glucose levels before and two hours after consuming a standardized glucose solution. It is used to diagnose glucose intolerance, type 2 diabetes, and gestational diabetes in pregnant women. This test is particularly useful for patients with borderline fasting or postprandial glucose levels and in the investigation of conditions like unexplained hyperglycemia, hypertriglyceridemia, and other metabolic abnormalities.
What type of sample is required for this test?Serum
Test ResourcesFor more information, please consult your healthcare provider.
Additional test information
The Glucose Tolerance Test (GTT), Two-hour (Oral WHO Protocol) evaluates the body's ability to metabolize glucose by measuring blood glucose levels before and two hours after consuming a standardized glucose solution. It is used to diagnose glucose intolerance, type 2 diabetes, and gestational diabetes in pregnant women. This test is particularly useful for patients with borderline fasting or postprandial glucose levels and in the investigation of conditions like unexplained hyperglycemia, hypertriglyceridemia, and other metabolic abnormalities.
Collection and processing
- Sample type: Serum
- Fasting: Yes
- Estimated laboratory processing: Results should arrive 1 – 2 business days after the lab receives samples.
How Sunridge uses laboratory information
Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.
Before requesting this test
Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.
Common questions about this laboratory test
- What sample does this test require?
- The listed sample type is Serum. Confirm current collection instructions in the approved order.
- Does this test require fasting?
- The current catalog record lists fasting as: Yes. Follow the instructions supplied with the approved order.
- How long does laboratory processing usually take?
- Results should arrive 1 – 2 business days after the lab receives samples.. Timing can change after collection or if a laboratory requires additional review.
About this test
DetailsThe Glucose Tolerance Test (GTT), Two-hour (Oral WHO Protocol) evaluates the body's ability to metabolize glucose by measuring blood glucose levels before and two hours after consuming a standardized glucose solution. It is used to diagnose glucose intolerance, type 2 diabetes, and gestational diabetes in pregnant women. This test is particularly useful for patients with borderline fasting or postprandial glucose levels and in the investigation of conditions like unexplained hyperglycemia, hypertriglyceridemia, and other metabolic abnormalities.
What type of sample is required for this test?Serum
Test ResourcesFor more information, please consult your healthcare provider.
Additional details
The Glucose Tolerance Test (GTT), Two-hour (Oral WHO Protocol) evaluates the body's ability to metabolize glucose by measuring blood glucose levels before and two hours after consuming a standardized glucose solution. It is used to diagnose glucose intolerance, type 2 diabetes, and gestational diabetes in pregnant women. This test is particularly useful for patients with borderline fasting or postprandial glucose levels and in the investigation of conditions like unexplained hyperglycemia, hypertriglyceridemia, and other metabolic abnormalities.
Highlighted health areas
- Metabolic function
- Nutrition
Biomarkers and report focus
The exact analytes and report format can change. Confirm the current contents in the Fullscript order before payment.
- Glucose, 2-hour (post 75 g glucose PO)
- Glucose, Fasting