1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Get the Diabetes Forum App for your phone - available on iOS and Android.
    Dismiss Notice
  3. Guest, we'd love to know what you think about the forum! Take the Diabetes Forum Survey 2019 »
    Dismiss Notice
  4. Diabetes Forum should not be used in an emergency and does not replace your healthcare professional relationship. Posts can be seen by the public.
    Dismiss Notice
Dismiss Notice
Find support, ask questions and share your experiences. Join the community »

Fasting Blood Glucose Test

Discussion in 'Ask A Question' started by Listlad, Apr 1, 2019.

  1. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    What does this test tell us?

    I am due for one this week (late booking owing to poor coordination between us all at my surgery).
     
  2. edan

    edan Type 2 · Well-Known Member

    Messages:
    135
    Likes Received:
    50
    Trophy Points:
    68
    It tells you your fasting blood sugar level. It’s used to diagnose diabetes.
     
  3. EllieM

    EllieM Type 1 · Well-Known Member

    Messages:
    1,579
    Likes Received:
    952
    Trophy Points:
    153
    And it's not very useful (just my opinion). I would have thought an hba1c or a glucose tolerance test would be far more informative.
     
    • Agree Agree x 3
  4. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    I see. I had the HbA1c at the end of February.
     
  5. Tipetoo

    Tipetoo Type 2 · Expert

    Messages:
    7,077
    Likes Received:
    10,234
    Trophy Points:
    198
    If it's the one I am thinking of for a fasting glucose test, they take a sample of blood from your arm. Then they get you to glug a small bottle of glucose drink down. After a period of time another blood draw is done, then after another hour another blood draw is done.

    I was at the pathology shop for a couple of hours every time I had them done, it's been a while now though. I get to see people getting them done when I go for blood tests, they always seat you near the toilets in the waiting room just in case you throw up..
     
    • Agree Agree x 1
    • Funny Funny x 1
    • Useful Useful x 1
  6. EllieM

    EllieM Type 1 · Well-Known Member

    Messages:
    1,579
    Likes Received:
    952
    Trophy Points:
    153
    Just seen that Feb's hba1c is 36. I can't honestly see what the point of a fasting blood sugar is in that case, unless they actually mean a glucose tolerance test? Or don't believe the hba1c for some reason? Could just be surgery incompetence?
     
    • Agree Agree x 2
  7. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    Nice one.

    I had one done last year. There were a heap of checks done from the same sample after fasting overnight. My last one in Feb 2018 was designated abnormal and in the diabetic range - 6.8 mmol/l
     
  8. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    What it is, is that they were all supposed to have been done at or around the same time. At the time I didn’t know that. Once I realised I should have had the other tests done around the same time I asked them to do those that hadn’t been done. Hence the delay.
     
    • Like Like x 1
  9. Tipetoo

    Tipetoo Type 2 · Expert

    Messages:
    7,077
    Likes Received:
    10,234
    Trophy Points:
    198
    Here's what is on the bottom of a hba1c report from the pathology shop that may be of use / interest to you

    [​IMG]
     
  10. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    Just looked this up:

    Fasting blood glucose level
    • If your blood glucose level is 70 to 99* mg/dL (3.9 to 5.5 mmol/L). . .
      • What it means: Your glucose level is within the normal range
    • If your blood glucose level is 100 to 125 mg/dL (5.6 to 6.9 mmol/L). . .
      • What it means: You have an impaired fasting glucose level (pre-diabetes**) . . .
    • If your blood glucose level is 126 mg/dl (7.0 mmol/L ) or higher on more than one testing occasion
      • What it means: You have diabetes
     
  11. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    My test result yesterday was 6.0 so that puts me in the Prediabetes range.

    The surgery records have it as within the normal range however.
     
    • Winner Winner x 1
  12. Oldvatr

    Oldvatr Other · Well-Known Member

    Messages:
    4,522
    Likes Received:
    2,844
    Trophy Points:
    198
    A fasting blood test is also normally done when testing for cholesterol levels in the blood, simply because cholesterol is significantly changed after a recent meal and results will be inconclusive,
     
  13. bulkbiker

    bulkbiker Type 2 · Master

    Messages:
    13,390
    Likes Received:
    10,059
    Trophy Points:
    298
    Just think ... if you bought your own meter you could get this number every morning and check whether its up or down..
     
    • Agree Agree x 2
  14. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    I haven’t ruled that out. I just put the idea on the back burner.
     
  15. Bluetit1802

    Bluetit1802 Type 2 (in remission!) · Guru

    Messages:
    24,412
    Likes Received:
    30,213
    Trophy Points:
    298
    I have to agree with some of the others. Once diagnosed, there is no point in further fasting blood glucose tests. They tell you very little. The best way forward is to buy a meter and test your own, keep records, and watch for trends. They are unreliable, particularly ones done in the surgery because by the time the test is taken other factors have come in play, such as anxiety of the test itself, rushing about before the test, and so on. All these things change our blood sugar levels.

    The main thing testing at home teaches us is the state of our insulin resistance. The more IR we have, the higher our fasting BG is likely to be, and the longer it takes to reach normal levels again.
     
  16. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    So, my medical record has me as prediabetic, my FBG has me in the prediabetic range. My HbA1c has me in the normal range. So reading between the lines I am still Prediabetic.
     
  17. Mr_Pot

    Mr_Pot Type 2 · Well-Known Member

    Messages:
    2,670
    Likes Received:
    1,305
    Trophy Points:
    178
    As someone who is pre-diabetic at worse you seem to be getting a lot more attention and testing than some on here who have high HbA1c and are definitely diabetic. Is there some special reason why you are getting this ideal but unusual treatment?
     
  18. Tophat1900

    Tophat1900 Type 3c · Well-Known Member

    Messages:
    1,232
    Likes Received:
    791
    Trophy Points:
    153
    FBG levels can bounce around, you could record a trend if you had a meter and see if it trends up or down over time. Rather then just having a once a year level done, which gives you no real worth while info due to the many variable reasons for why a level is higher or lower on just one particular day. That's if that sort of thing interests you.
     
  19. Tophat1900

    Tophat1900 Type 3c · Well-Known Member

    Messages:
    1,232
    Likes Received:
    791
    Trophy Points:
    153
    Your fasting blood glucose level does not trump your hba1c level. And that is good news. I wouldn't say you are pre-diabetic, unless I'm missing something?
     
    • Like Like x 1
  20. Listlad

    Listlad Prediabetes · Well-Known Member

    Messages:
    2,937
    Likes Received:
    1,519
    Trophy Points:
    178
    That is a very good question. And the answer is not straight forward. This might help explain:

    1] For 7 years I was in the care of the Isle of Man NHS. They were a bit more proactive with my care even if they didn’t advise LCHF. I got used to asking which was almost always responded to positively. I brought that expectation back with me to the UK in 2017.

    2] This latest test should have been carried out when I had my HbA1c test done in late February. This was because I didn’t ask (ignorance on my part) and they didn’t arrange it proactively. I had to ask for the HbA1c test and the FBG test. If I hadn’t asked then I would be nonethewiser now.

    3] In general I do ask (nicely) and find it helps. I cherry pick the best GP for me where I can. That helps too.

    4] My GP is very LCHF freindly as explained before. That helps.

    5] I am also registered with hypertension so that is likely to be another factor.

    All or some of the above are likely to be factors.
     
  • Meet the Community

    Find support, connect with others, ask questions and share your experiences with people with diabetes, their carers and family.

    Did you know: 7 out of 10 people improve their understanding of diabetes within 6 months of being a Diabetes Forum member. Get the Diabetes Forum App and stay connected on iOS and Android

    Grab the app!
  • Tweet with us

  • Like us on Facebook