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Glucose Tolerance Test - Extended (GTT) - 5 Samples

The Glucose Tolerance Test (GTT) - Extended, with 5 samples, is a diagnostic procedure utilized to analyze how effectively the body processes sugar. It's vital for detecting disorders such as diabetes, insulin resistance, and sometimes reactive hypoglycemia. The GTT involves fasting, followed by consuming a glucose-containing drink, and then having your blood tested at regular intervals. With the 5-sample GTT, blood samples are taken at fasting, 1 hour, 2 hours, 3 hours, and 4 hours after consuming the glucose solution.


  • Profile Name: Glucose Tolerance Test - Extended (GTT) - 5 Samples
  • Sample Type: Blood
  • Preparations Required: You will need to fast for at least 8 hours before the test. During fasting, only water is allowed. Avoid consuming any beverages like tea, coffee or juice.
  • Report Time: 4 hours

Glucose is a primary source of energy for the body. The glucose tolerance test measures how swiftly the body clears glucose from the blood. It is a significant test because an abnormal clearance rate can be indicative of a medical condition such as diabetes.

Home Sample Collection Process
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Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
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Reporting of the sample at lab
Reporting of the sample at lab
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Frequently Asked Questions

The 5-sample GTT provides a detailed profile of how your body processes glucose over an extended period. It is particularly beneficial in diagnosing diabetes, gestational diabetes in pregnant women, insulin resistance, and other conditions affecting glucose metabolism.

You should fast for at least 8 hours before the test. Drink only water during this period and avoid any other beverages or food.

Initially, a blood sample is taken to measure your fasting glucose levels. Afterward, you’ll consume a glucose-rich drink. Subsequent blood samples will be taken at 1 hour, 2 hours, 3 hours, and 4 hours post-drink to observe how your body handles the glucose.

The results display how your glucose levels change over time. If the levels are significantly elevated compared to the standard range, it can indicate diabetes or another glucose metabolism disorder.

If your GTT results are abnormal, consult your doctor for advice. They might recommend lifestyle changes, medications, or additional testing to pinpoint the specific issue.

The test is generally safe. However, some people might experience lightheadedness, nausea, or, rarely, a drop in blood sugar levels.

While it can vary, generally the normal values are: fasting, below 100 mg/dL; 1-hour, below 180 mg/dL; 2-hours, below 140 mg/dL; 3-hours, below 120 mg/dL; and 4-hours, close to your fasting level.

Several factors can affect the test results including, but not limited to, medication use, recent dietary changes, level of physical activity, and the presence of other medical conditions.

The frequency of testing depends on various factors including your health, family history, and any existing medical conditions. Your doctor can provide the best guidance on how often you should be tested.

You should consult your primary care doctor who may then refer you to an endocrinologist if necessary.

While commonly used for diabetes diagnosis, it can also be used to diagnose insulin resistance, reactive hypoglycemia, and to assess glucose metabolism in general.

Yes, certain medications can affect blood glucose levels. It’s important to inform your doctor about all medications you’re taking.

Yes, this test is often performed during pregnancy to check for gestational diabetes, which can affect both the mother and baby's health.

Most individuals can drive home after the test. However, if you feel lightheaded or unwell, it’s advisable to have someone accompany you.

No, you should not eat or drink anything other than the provided glucose solution during the test.

Understanding how your body processes glucose is essential to maintaining good health, especially if you have risk factors for diseases like diabetes. The Glucose Tolerance Test - Extended (GTT) with 5 samples is an invaluable tool that aids doctors in understanding and managing your glucose metabolism. If your results are abnormal, it’s essential to follow your doctor’s recommendations for managing your health.

GLUCOSE TOLERANCE TEST (5 SAMPLES), SODIUM FLUORIDE PLASMA
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