Taranaki Med Lab | Glucose Tolerance Test (GTT)

About your test

Your doctor / midwife have requested this test to help in the diagnosis of diabetes.
For your glucose tolerance test we require you to fast (not eat or drink anything other than plain water for 12 hours prior to your test).
You will need to remain at Taranaki Medlab for just over 2 hours.
During this time you will be required to rest. You may like to bring a book to read.
You will not be able to eat during your test, but will be able to drink water.
You must not smoke during your test.
Your test results will be sent to your doctor within 24 hours.

Phone the laboratory to make an appointment.
For at least 3 days before your test:
Enjoy your normal diet without any restrictions, including sugar, and take your normal exercise.
Continue with your normal medications unless your doctor advises otherwise.
On the evening before your test do not have anything to eat after 8.00pm. You may drink water only.
On the morning of your test do not eat breakfast – you may drink water.
Continue with your normal medications unless your doctor advises.
When you first arrive at Taranaki Medlab a blood sample will be collected.
You will then be given a drink containing 75g of glucose. You will be asked to drink this within 3-4 minutes.
Please tell a staff member if you feel unwell at any time during your test, e.g. if you feel drowsy, dizzy or nauseous.
Further blood samples will be collected at 1 hour and 2 hour intervals.
This completes your test and you may eat and drink normally.