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Re: [IPk] BGs and HbA1c

The "w" in the formulae are "divided by" - for some reason the coding 
didn't come thru. Oops!

At 09:20 PM 20/07/2003, you wrote:

>I've actually managed to predict accurately my last 2 HbA1c's, using the 
>following formula. (I use a Medisense Optium - also called a Precision 
>Xtra - meter, but these seem to work for most meter readings. It will 
>depend somewhat on how often you test, but it gives reasonably accurate 
>ball park numbers for most - meaning people who test 3-6x/day or more). 
>The "average BG reading" is the average over the last month.
>Using plasma glucose readings (which most meters these days measure, but 
>your meter manual/guidelines should tell you whether it measures plasma or 
>whole blood):
>HbA1c = (average blood glucose {in mmol/l} + 4.2944)w 1.9777
>HbA1c = (average blood glucose {in mg/dL} + 77.3)w 35.6
>If you use an older meter which measures whole blood - and some newer 
>ones, including the Optium, for example - the mean (average) glucose 
>reading measures lower and so the HbA1c is actually higher than results 
>using the above formula. The below should be used:
>HbA1c = (average blood glucose {in mmol/l} + 4.778)w 1.85
>HbA1c = (average blood glucose {in mg/dL} + 86)w 33.3
>I'd be interested to know if others find these accurate or if it's just me!

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