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Diabetes Management
Blood Glucose Monitoring
One of my meters is lying
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<blockquote data-quote="Oldvatr" data-source="post: 2406270" data-attributes="member: 196898"><p>Depends on what you want the result to be. A fingerprick result is a spot check and is frozen in time. If you take enough of them you can get an average over the time period, or by day or by week so it will have the result of removing the individual peaks and troughs, so giving a more mellow result, and reducing noise. So that takeaway last night will gradually recede into the distance in terms of its overall effect on your body. The HbA1c is like an average over several months and gives a general feeling of how well your overall control is, so is useful for making long term adjustments to medication, etc. (tweaking)</p><p></p><p>The fingertip test results are the frightening ones. These are used for bolus doses and compensation doses of insulin, so need to be the most accurate.</p><p></p><p>The HbA1c is a warm fuzzy feeling if good, a tut-tut from the doc if not.</p><p></p><p>I use fingertip because I do it daily with a food log, so I can immediately identify those meals that cause a 'slap-head' moment and I can also average them myself and see the trend they are going in. I can also do a moving average that allows me to emulate the HbA1c. I think most meter Apps can do these nowadays,</p><p></p><p>The accuracy obeys the GIGO rule, garbage in - garbage out so it s the accuracy of conversion of whatever meters you are using that determines accuracy. Averaging smooths out any meter errors over time so gives a more stable figure </p><p></p><p>Bear in mind that the YSI or Beckmann blood analyzers used in the Lab are only 3% accurate themselves</p><p></p><p>The monthly average result is like HbA1c, and there is a conversion tool on this website you can use to convert between the two. But they are measuring different things. Modern meters are calibrated to give results that are closer to the lab results, but older meters used to be calibrated to 'plasma' blood and were a factor of 1.2 out.</p><p></p><p>The Libre is factory calibrated to meet the same as fingertip meters. It requires a scan every 8 hours to get the most accurate results. Longer sample periods reduce accuracy.</p></blockquote><p></p>
[QUOTE="Oldvatr, post: 2406270, member: 196898"] Depends on what you want the result to be. A fingerprick result is a spot check and is frozen in time. If you take enough of them you can get an average over the time period, or by day or by week so it will have the result of removing the individual peaks and troughs, so giving a more mellow result, and reducing noise. So that takeaway last night will gradually recede into the distance in terms of its overall effect on your body. The HbA1c is like an average over several months and gives a general feeling of how well your overall control is, so is useful for making long term adjustments to medication, etc. (tweaking) The fingertip test results are the frightening ones. These are used for bolus doses and compensation doses of insulin, so need to be the most accurate. The HbA1c is a warm fuzzy feeling if good, a tut-tut from the doc if not. I use fingertip because I do it daily with a food log, so I can immediately identify those meals that cause a 'slap-head' moment and I can also average them myself and see the trend they are going in. I can also do a moving average that allows me to emulate the HbA1c. I think most meter Apps can do these nowadays, The accuracy obeys the GIGO rule, garbage in - garbage out so it s the accuracy of conversion of whatever meters you are using that determines accuracy. Averaging smooths out any meter errors over time so gives a more stable figure Bear in mind that the YSI or Beckmann blood analyzers used in the Lab are only 3% accurate themselves The monthly average result is like HbA1c, and there is a conversion tool on this website you can use to convert between the two. But they are measuring different things. Modern meters are calibrated to give results that are closer to the lab results, but older meters used to be calibrated to 'plasma' blood and were a factor of 1.2 out. The Libre is factory calibrated to meet the same as fingertip meters. It requires a scan every 8 hours to get the most accurate results. Longer sample periods reduce accuracy. [/QUOTE]
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