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Freestyle Libre delay/extrapolation
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<blockquote data-quote="Westley" data-source="post: 1044895" data-attributes="member: 254425"><p>The manual says readings may be inaccurate when sugars are rising or falling rapidly (which has been frustratingly often just recently <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite36" alt=":grumpy:" title="Grumpy :grumpy:" loading="lazy" data-shortname=":grumpy:" /> ).</p><p>I've also seen several mentions on here of a delay of somewhere between 5 and 15 minutes compared to blood tests.</p><p></p><p>However, it seems to me that it is not simply a fixed delay. Sometimes I take a reading when it is falling fast and get a low reading of, say 3.0, then a while after I have treated the hypo I scan again and look back at the graph and it then shows the lowest it got before coming back up was 4.0 or more. Same thing with fast rising and high readings.</p><p></p><p>It looks to me like it is <em>extrapolating</em>. So it knows its interstitial fluid reading is behind the blood, and based on the current rate of change it tries to match what the blood actually is currently. The manual distinguishes between levels <em>measured</em> and levels <em>reported</em>, which would fit this.</p><p></p><p>Does this match with your experience? (and do you think it is linear or higher order?)</p><p></p><p>Also, when we look back at the recorded data, are the actual IF readings already appropriately shifted back to give the approximate blood reading at that time?</p><p></p><p>I'm trying to get a better understanding of the time taken for different doses/foods to affect me, and it's a bit annoying that Abbott aren't open about this, and the meter doesn't distinguish between what it is actually reading and what is an informed guess. I'd rather it showed the extrapolated part of the curve in a different colour at least.</p></blockquote><p></p>
[QUOTE="Westley, post: 1044895, member: 254425"] The manual says readings may be inaccurate when sugars are rising or falling rapidly (which has been frustratingly often just recently :grumpy: ). I've also seen several mentions on here of a delay of somewhere between 5 and 15 minutes compared to blood tests. However, it seems to me that it is not simply a fixed delay. Sometimes I take a reading when it is falling fast and get a low reading of, say 3.0, then a while after I have treated the hypo I scan again and look back at the graph and it then shows the lowest it got before coming back up was 4.0 or more. Same thing with fast rising and high readings. It looks to me like it is [I]extrapolating[/I]. So it knows its interstitial fluid reading is behind the blood, and based on the current rate of change it tries to match what the blood actually is currently. The manual distinguishes between levels [I]measured[/I] and levels [I]reported[/I], which would fit this. Does this match with your experience? (and do you think it is linear or higher order?) Also, when we look back at the recorded data, are the actual IF readings already appropriately shifted back to give the approximate blood reading at that time? I'm trying to get a better understanding of the time taken for different doses/foods to affect me, and it's a bit annoying that Abbott aren't open about this, and the meter doesn't distinguish between what it is actually reading and what is an informed guess. I'd rather it showed the extrapolated part of the curve in a different colour at least. [/QUOTE]
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