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Oral glucose test

Discussion in 'Ask A Question' started by jumbleannie1VDJQ, Sep 2, 2012.

  1. jumbleannie1VDJQ

    jumbleannie1VDJQ · Well-Known Member

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    I have to go for yet another oral glucose test,(the doc seems to think I have crossed the threshold from pre to full blown diabetes). My question is why do I have to fast before it? If I fast I get liver dumping and my starting levels will be higher than normal, ergo my start level will be higher. Does it then follow that my sugar levels will rise even higher than usual, and if they do, will that not make the 2hr reading higher than normal anyway? My fasting count is usually around 5.9 - 6.2. 2 hours after breakfast my reading is usually below 6, but if I skip breakfast it can be as high as 6.5+. The test isn't untill 9:30 and I am awake at 5:30 giving it plenty of time to rise. Just curious :?
  2. smidge

    smidge LADA · Well-Known Member

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    Hi Jumbleannie!

    Sorry to hear you might have crossed into full-blown diabetes.

    The OGTT is just a test to measure how well your body is metabolising sugar. It measures the difference between your fasting level and the 2 hour level after a measured quantity of glucose. In many senses, it doesn't matter where you start out, it is how well your body brings you back down to that level that is really being tested. Now, obviously if you start higher you will probably be higher at the 2 hour mark and the higher you are when you start, the less well your body will probably cope with the measured glucose. However, it doesn't really matter, because a high morning fasting level is indicative of diabetes in itself anyway (non diabetics do not have high fasting levels as their bodies are able to metabolise any glucose in their blood quickly). They have to do the OGTT as a fasting test to make sure it is only the measured glucose that is having an impact - if you'd eaten breakfast, that would be having an impact as well and would give a false reading.

    The bottom line is that there is nothing to fear and nothing to feel ashamed of if you are now diabetic. All that will happen in the short term is that you will get more closely monitored (eye checks, feet checks etc etc) which is no bad thing really. If your HbA1c is good and you can manage your BG on diet and exercise, there will be no need for any medication. If that's not the case, then you can start the appropriate medication to make sure your BGs do get to and stay in a range that will help keep you healthy and complication-free.

    Good luck

  3. searley

    searley Type 1 · Moderator
    Staff Member

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    I have never has a glucose test, is that because my hba1c was high enough to confirm diabetes without one? My hba1c at diagnosis was 7.4
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