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Apollo BGS Hospitals, MysoreWhat is Oral Glucose Tolerance Test (GTT)?

What is Oral Glucose Tolerance Test (GTT)?

What is Oral Glucose Tolerance Test (GTT)?


The oral Glucose Tolerance Test involves the taking of three to four blood samples; one when you arrive (fasting for 8-14 hours) and others at the end of one, two and three hours after a glucose drink depending on the type of GTT (75 or 100 gms).


  • After the fasting blood has been taken and after you have taken the glucose drink, you will be required to remain in the hospital for 3 hours, at the end of one hour second blood specimen will be taken and every hour up to three hours.
  • Throughout the test (the 3 hours between the four blood samples), please observe the following
    • No Food
    • No Drinks (sweetened /unsweetened tea/coffee or any beverage).
    • No Smoking
    • No Exercise
    • Drink plain water.
  • Please report back to the Phlebotomy Outpatient Department in time to have your second blood sample (within 1 hour of glucose drink) taken and subsequently every hour till completion of test.
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