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<blockquote data-quote="xyzzy" data-source="post: 244719" data-attributes="member: 40343"><p>Classic!</p><p></p><p>No I wouldn't recommend this but if you want to estimate your HbA1c from your own BG readings you can do the following. I do it in my excel spreadsheet that I use to monitor myself with. This mirrors the methodology they used to calculate HbA1c from the sample of test data they got from loads of people.</p><p></p><p>Measure 7 times a day, a fasting level when you wake up then pre and post + 2 hours each meal (I actually do 7 readings but as my fasting is the same as my pre breakfast so I do an extra at +4 hr in the evening)</p><p></p><p>At present I do not have 120 days of readings and and so until then I am estimating by taking 75% of the average of the last 30 days and adding to that 25% of my overall average. If you have got 120 days of readings you can hunt down the exact weightings to use on line or I'm sure someone will tell us once they read this.</p><p></p><p>Anyway after working out the weighted average an HbA1c ESTIMATE can be calculated using.</p><p></p><p>HbA1c = (AVERAGE_BS *18.05 +46.7)/28.7</p><p></p><p>To convert to the new IFCC measure take the HbA1c you have calculated and use</p><p></p><p>IFCC =(hbA1C-2.15)*10.929</p><p></p><p>My spreadsheet currently projects me to be at an HbA1c of 5.8% from an initial start of 9.9%. Will be interesting to see how close the estimate is to real life in a few weeks time.</p></blockquote><p></p>
[QUOTE="xyzzy, post: 244719, member: 40343"] Classic! No I wouldn't recommend this but if you want to estimate your HbA1c from your own BG readings you can do the following. I do it in my excel spreadsheet that I use to monitor myself with. This mirrors the methodology they used to calculate HbA1c from the sample of test data they got from loads of people. Measure 7 times a day, a fasting level when you wake up then pre and post + 2 hours each meal (I actually do 7 readings but as my fasting is the same as my pre breakfast so I do an extra at +4 hr in the evening) At present I do not have 120 days of readings and and so until then I am estimating by taking 75% of the average of the last 30 days and adding to that 25% of my overall average. If you have got 120 days of readings you can hunt down the exact weightings to use on line or I'm sure someone will tell us once they read this. Anyway after working out the weighted average an HbA1c ESTIMATE can be calculated using. HbA1c = (AVERAGE_BS *18.05 +46.7)/28.7 To convert to the new IFCC measure take the HbA1c you have calculated and use IFCC =(hbA1C-2.15)*10.929 My spreadsheet currently projects me to be at an HbA1c of 5.8% from an initial start of 9.9%. Will be interesting to see how close the estimate is to real life in a few weeks time. [/QUOTE]
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