# Re: [IPk] BGs and HbA1c

```Yes, of course, I'd already writen too much, and the difference between
the hba1c and meter average (even if the meter is used every hour, and
at no other time) is something which has a far bigger impact, of course
(and one can set one's meter average on the computer to whatever one
likes, at least with my meter: on meter it's 2 weeks, though.  It would
be nice to have a 'mimic the hba1c and predict it' function, too ...

onIn message <email @ redacted>, Diana Maynard
<email @ redacted> writes
>Hi Pat
>I believe there's some evidence that thre HbA1C is skewed in several
>ways. First, it takes more account of more recent readings (last 2-3
>weeks) than preceding ones. Also, remember that meter readings are on
>the spot readings and don't give you an accurate picture of things. For
>example, if you always test 2 hours after a meal and get e.g. a reading
>of 8 mmol/l on average, and you test pre-meals and get an average of 5
>mmol/l, that would suggest your average overall is somewhere between the
>two. But in fact, your true average is probably nearer 5 than 8, because
>you're at the post-meal BG for only a very short period of time every
>day, whereas you're at the pre-meal one for a lot longer. Of course,
>that's a simplistic example, but you get the point.
>I certainly can never deduce anything from BG averages, curves, etc from
>my meter, because I test more when I'm high or low than when I'm normal,
>and I test more when I'm high than when I'm low. If I know I'm low, I
>don't need to test. If I know I'm high, I still need to test. And I test
>a lot to see how my BG's coming down, whereas I don't need to test to
>see if my BG's coming up.
>Di
>
>
>>
>> You mention 'up to 15 after meals'.  Someone said here recently that
>> metres can give false highs up to 2 hours after a meal.  I too find that
>> my hba1c comes out lower than my meter average says it should (by the
>> way, just in case you think that a hba1c of, say, 6.8 equates to a meter
>> average of 6.8 - it doesn't, the meter average would be 8.0.  A hba1c of
>> 12 would have a meter average of 16.7.
>> Best wishes,
>>
>> Pat
>> (dm 30+, 508 2+)
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--
Pat Reynolds
email @ redacted
"It might look a bit messy now,
but just you come back in 500 years time"
(T. Pratchett)
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