2 Hour Glucose Tolerance Test

** You must phone the laboratory for an appointment **

New Plymouth - 758 7450 option 1
Stratford - 765 6229
Hawera - 278 4880

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.


The procedure

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.

If you require further information regarding your test procedure, please telephone Taranaki Medlab:

New Plymouth - 758 7450
Stratford - 765 6229
Hawera - 278 4880