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<blockquote data-quote="igmr" data-source="post: 673138" data-attributes="member: 110227"><p>A gross oversimplification. . Directly from Abbots site</p><p></p><p>"A finger prick test using a blood glucose meter is required during times of rapidly changing glucose levels when interstitial fluid glucose levels may not accurately reflect blood glucose". or, put more simply, interstitial values are delayed (historic) compared to BG tests.</p><p></p><p>my understanding - which could be wrong - is that interstitial fluid glucose levels lag behind blood glucose levels by several minutes. So what the scan gives you is roughly where your blood glucose levels were 15/20 minutes previously. I checked the exported file data. The sensor logs a reading every 15 minutes and these seem to better correlate to blood glucose readings taken 20 to 30 minutes earlier than those taken at the same time - with around 1mmol difference.</p><p></p><p>The implications, again, if I am right, is that when your glucose levels increase BG values will seemingly race away from scan (interstitial) values. Then your BG will peak, start to drop and can actually go lower than your scan values. Draw two identical bell curves, one starting 30 mninutes after the other and you will see exactly what I mean.</p><p></p><p>Okay, this is theory, I doubt Abbott will ever confirm it. but it fits everything I have seen from the Libre so far, it matches wjhat the export data shows and it matches exactly what the scans v bg test show. With my first sensor the sensor value was always about 1mmol lower 20 minutes later than the bg value. Which is why Abbott tell you to finger prick when you have rapid changes happening. I'm in the process of checking my second sensor but its coming out similar</p><p></p><p>Consequently - whether for the right reasons or not - I trust and have very successfully changed my insulin regime using the scan charts - they are accurate - but I will never take a scan value as a current BG value.. I trust and use the BG values to calculate bolus and for driving records. There are two entirely different glucose measuring systems on the same meter; one of which is tells you where you are NOW the other gives you a historical map of where your glucose was / has been,</p><p></p><p>And, oh boy is that historical map useful for sorting your insulin timing and dosage out. I've been able to extensively modify my Levemir from it and I'm now starting to time and adjust my novorapid to match the food I eat.</p><p></p><p></p><p></p><p></p><p>.</p></blockquote><p></p>
[QUOTE="igmr, post: 673138, member: 110227"] A gross oversimplification. . Directly from Abbots site "A finger prick test using a blood glucose meter is required during times of rapidly changing glucose levels when interstitial fluid glucose levels may not accurately reflect blood glucose". or, put more simply, interstitial values are delayed (historic) compared to BG tests. my understanding - which could be wrong - is that interstitial fluid glucose levels lag behind blood glucose levels by several minutes. So what the scan gives you is roughly where your blood glucose levels were 15/20 minutes previously. I checked the exported file data. The sensor logs a reading every 15 minutes and these seem to better correlate to blood glucose readings taken 20 to 30 minutes earlier than those taken at the same time - with around 1mmol difference. The implications, again, if I am right, is that when your glucose levels increase BG values will seemingly race away from scan (interstitial) values. Then your BG will peak, start to drop and can actually go lower than your scan values. Draw two identical bell curves, one starting 30 mninutes after the other and you will see exactly what I mean. Okay, this is theory, I doubt Abbott will ever confirm it. but it fits everything I have seen from the Libre so far, it matches wjhat the export data shows and it matches exactly what the scans v bg test show. With my first sensor the sensor value was always about 1mmol lower 20 minutes later than the bg value. Which is why Abbott tell you to finger prick when you have rapid changes happening. I'm in the process of checking my second sensor but its coming out similar Consequently - whether for the right reasons or not - I trust and have very successfully changed my insulin regime using the scan charts - they are accurate - but I will never take a scan value as a current BG value.. I trust and use the BG values to calculate bolus and for driving records. There are two entirely different glucose measuring systems on the same meter; one of which is tells you where you are NOW the other gives you a historical map of where your glucose was / has been, And, oh boy is that historical map useful for sorting your insulin timing and dosage out. I've been able to extensively modify my Levemir from it and I'm now starting to time and adjust my novorapid to match the food I eat. . [/QUOTE]
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