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HbA1c reading from BG levels

Discussion in 'Diabetes Discussions' started by AM1874, May 21, 2017.

  1. AM1874

    AM1874 Type 2 · Well-Known Member

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    A few weeks ago I was given a formula for calculating HbA1C from average BG levels. I have applied this formula for the past two months (see my sig block). I was advised, though, by a number of folk on here (thanks all), that this would probably not match my subsequent lab-tested HbA1C reading .. and sure enough, it didn't.

    My calculated HbA1c for April was 36, and for May it was 33 .. but a lab-tested reading today was 40. This was taken on 18th but it is already on-line with all the numbers for my first annual review on 25th.

    With this information, I have now re-jigged all the calculations I made when using the HbA1c conversion, partictularly to take in the previous 90 days worth of BG readings, rather than averages for the month .. and I can confirm that the formula is accurate but I made some errors in the averaging process. I was advised about this but still managed to get it (a bit) wrong .. so for anybody using the formula I would recommend double and even triple checking ..

    Anyway, the bottom line is that my "actual" HbA1c is now sitting pretty at 40 .. and I'm a happy man :joyful:

    (sig block to be upated after review)
     
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  2. andcol

    andcol I reversed my Type 2 · Well-Known Member
    Retired Moderator

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    If you load your data into the application I have written it will not only give you an estimate of your HbA1c using the last 90 days of readings but will also give you a measure for the readings being at20% tolerance so you will get an upper and lower bound. Additionally the graph will give you your HbA1c of any point and using the trend graphs can give you a pretty good estimate with a lot less data than 90 days worth.

    Have a look at the thread in my signature. There are many other features that may peak your interest.

    Well done on the 40 HbA1c.
     
  3. AM1874

    AM1874 Type 2 · Well-Known Member

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    Hi @andcol ..
    Thanks .. I'm no techie so I have been using a simple spreadsheet for recording my BG levels .. fasting, pre and post-prandial every day .. and then just playing with formulae for averaging and so on .. all a bit clunky but it works for me, apart from the errors described above :meh:
    Anyway, I'm a bit pushed for time at present .. lots of golf comps, holidays and family trips coming up .. but I will have a look at your app when things settle down a bit .. it all looks very interesting
    Many thanks again ..
     
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