Glucose Tolerance Test (GTT), Two-hour (Oral WHO Protocol) Blood Test
Compare labs
| Feature |
Labcorp
|
Quest Diagnostics
|
|---|---|---|
| Price | $12.99 | Coming soon |
| Results in | ~2 business days | — |
| Sample type | Blood Serum | — |
| Require fasting | Yes | — |
About the test
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.
Included biomarkers & Reference ranges
| Biomarker | Reference range |
|---|---|
| Fasting Glucose Blood sugar measured after fasting, one of the primary tests used to screen for prediabetes and diabetes. | — |
| Glucose, 2-Hour (after 75 g Oral Glucose) Your blood glucose two hours after a 75 g glucose drink, a key value in the oral glucose tolerance test for diabetes and prediabetes. | — |
Reference ranges vary by lab, age, and sex (M/F). Your report shows your exact range. Click any biomarker to see its optimal range and what your results mean.
Preparation
- Stay active and eat your regular diet for at least 3 days before your blood draw. Your daily diet should include at least 150 grams of carbohydrates (examples: bread, rice, fruit, pasta).
- Fasting for 8 to 14 hours before collection is required.
- Fasting before a blood draw means you don't eat or drink anything except water.
- Your doctor should provide any special instructions related to fasting for your test. Always follow your doctor's instructions.
- If possible, stop taking nonessential medications that can affect blood sugar (glucose) at least 3 days before your blood draw. DO NOT discontinue any prescription medications without first consulting your healthcare provider.
How it works
- 1. Order online No referral or insurance
- 2. Get a requisition By email in 24–72 hours
- 3. Visit a draw center Bring a matching photo ID
- 4. Get results Securely by email
- These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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