HbA1c's relationship to bg readings

I've answered this before, so just had to cut and paste
I don't know the formula used for the one on this site.

Here's the formula adapted from the ADA one. As far as I know this is the only formula based on recent worldwide evidence.
(though you're supposed to use it the other way round from Hb A1c to estimated average glucose level)
(average glucose in mmol/l x18) + 46.7
...................28.7
Sorry about the extra dots, it's the only way I could get the 28.7 into the 'right' place!
http://professional.diabetes.org/GlucoseCalculator.aspx

Click to expand...

Hi,

I was at the diabetes clinic last week, adn they had a conversion chart on teh wall....I remembered that 48 on the new scale, was a 7 on the old, according the DUK site...so I looked at it, to conform that an "under 48" would a good figure, only to fond that they had an old 7, as a 54..

Wish I could remember the name of the company who produced it..might have been useful! I do not know who is right/wrong, or whether statistically this is within experimental error.

I've just played around with the converter on this site. It rounds up or down to the nearest whole percentage when you try to convert mmol/mol to DCCT HbA1c % It's more accurate the other way round from HbA1c %.
The formulas are: (I cut and pasted found them from one of the 'official docs but I forgot to link)

IFCC HbA1c unit (mmol/mol) = 10.93 x DCCT/NGSP unit (%) – 23.50
DCCT/NGSP HbA1c unit (%) = 0.09148 x IFCC unit (mmol/mol) + 2.152
therefore
48mmol/mol= 6.54304%

This seems to be a good chart
http://baspath.co.uk/Hba1c_table.pdf