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Glucose Tolerance Test - Extended - 4 samples

Glucose Tolerance Test - Extended - 4 samples

Glucose Tolerance Test (GTT), specifically the extended version with 4 samples, is a medical test that determines how quickly glucose is cleared from the blood. It is primarily used to diagnose diabetes, a condition that impairs the body's ability to process blood sugar. The test may also be used to diagnose gestational diabetes, a type of diabetes that develops during pregnancy.


  • Test Name Glucose Tolerance Test - Extended (GTT) - 4 samples
  • Sample Type Blood
  • Preparations Required Fasting for 8-12 hours is required; only water can be consumed in this period. Please avoid strenuous physical activity before the test.
  • Report Time 4 hours

In the GTT, the patient fasts overnight, and a baseline blood sample is taken. Then, the patient consumes a high-glucose drink, and additional blood samples are taken at intervals (usually every hour) over the next several hours. In the extended GTT, four samples are taken at specified intervals, providing a detailed picture of how the body metabolizes glucose over time.

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 GTT is primarily used to check for type 2 diabetes and gestational diabetes. It measures how quickly your body clears sugar from the bloodstream.

You will be asked to fast for 8 to 12 hours. Then, a blood sample is taken to measure your fasting glucose level. You will then drink a high-glucose solution, and additional blood samples will be taken at hourly intervals.

You will need to fast for 8-12 hours before the test. Only water is allowed during this time. It is also advised to avoid heavy physical activities before the test.

High blood glucose levels at any two or more blood test times during the GTT may indicate diabetes. Your doctor will interpret the results and guide you accordingly.

There are minimal risks associated with the GTT. You might feel faint or lightheaded due to fasting. In rare cases, the blood draw can lead to infection.

The frequency of the GTT depends on your risk factors for diabetes. If you are at high risk, your doctor might recommend regular testing.

The normal values can vary, but generally, a fasting glucose level below 100 mg/dL is considered normal. Your doctor will explain what your specific results mean.

Certain medications, level of physical activity, food and drink, and the time of day can all affect the results of a GTT.

If your GTT values are abnormal, consult your doctor who can provide guidance based on your overall health condition and other factors.

Individuals with risk factors for diabetes, pregnant women, or those experiencing symptoms of high or low blood sugar should consider getting a GTT. Always consult with your doctor.

The extended Glucose Tolerance Test (GTT) with 4 samples is a crucial tool for diagnosing diabetes and monitoring the body's glucose metabolism. It's a simple test, but it provides vital information that can significantly affect an individual's health management plan. As with any medical procedure, any concerns or questions should be addressed with your doctor to ensure you have the most accurate understanding of the process and what your results mean.

Glucose Tolerance Test - Extended (GTT) - 4 samples
₹ 400
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