Glucose Tolerance Test (GTT)

• You are to remain on a normal, unrestricted diet for at least 3 days prior to test.
• You have had no acute significant illness for 2 weeks prior to test.
• Fasting is required for a period of 8-10 hours prior to the test. (No food or fluids such as tea, coffee or fruit juice.) You may have sips of water if you are thirsty.
• Due to the nature of the test, testing is generally done in the morning.
• Maintain normal activity prior to the test.
• Bring a list of any current medications with you to the collection centre.
• Avoid smoking for one hour before and during test.
• Before drinking the glucose, please inform the collection staff if you have any allergies.

What to do during the procedure

• You must remain seated quietly for 30 minutes before and during the test.
• You will be at the collection centre for a minimum of 2 hours and 45 minutes.
• You are required to remain in the collection centre until the procedure is completed.
• Bring some reading material or other activity to pass the time.
• If you feel unwell during the test, please inform the collection staff as you may wish to lie down.

What the Procedure involves

• A fasting blood sample collected.
• A 75g bottle of glucose to drink within 5 minutes.
• A 1 hour post glucose blood sample collected.
• A 2 hour post glucose blood sample collected.