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Libre 2 sensor and testing
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<blockquote data-quote="In Response" data-source="post: 2679951" data-attributes="member: 527103"><p>Both LIbre and finger pricks conform to a standard which allows +/-15% accuracy. So depending upon your levels, the difference between the two may vary. For example, if your "real" BG was 10, your two meters could independently report anything between 8.5 and 11.5. Therefore, a usual" difference of 1 is within this tolerance. </p><p>However, there are a few other things to consider</p><p>- insertion trauma - some people find that their body takes 24 to 48 hours to adjust to an alien object inserted in their arm. During this period, the readings may app[ear random. If you experience this, it is common to apply your new sensor a day before starting it. In your other arm, obviously. </p><p>- compression low - if you apply pressure to a sensor, it will block of the flow of fluid to the sensor. As a result, you may receive a false low. This is most common at night when you may lie on your arm with your sensor.</p><p>- interstitial fluid delay affect - CGMs like Libre do not read blood glucose. They read interstitial fluid and use an algorithm to convert this to a BG reading. A change in BG will be reflected in the interstitial fluid reading after about 10 minutes. The algorithm used will take this into consideration by extrapolating the current trend. This is great most of the time. However, if your BG trend has changed in the last 10 minutes, the extrapolation will be incorrect. This is most commonly observed when recovering from a treated hypo - your Libre will suggest it takes longer to recover.</p><p>- highs and lows - CGMs like Libre are designed to be most accurate at "normal" levels which is typically between about 4 and 9. Outside of this range, they may have a tendency to exaggerate highs and lows. Therefore, it is recommended to check a high or low with a finger prick before correcting. If you are experiencing an obvious hypo, there is no need to double check. </p><p>- factory calibration - cheaper CGMs likes Libre and Dexcom One are factory calibrated with no option for home calibration against your finger pricks. This is fine for most people but some of us find that we are slightly different to "factory man". There are unofficial apps like xDrip+ on Android and Shuggah on iPhone which allow calibration (and other features). The possible downside is that these do not upload your readings to LibreView for your DSN to review. </p><p>- faulty sensors - unfortunately, some sensors are faulty. This may be extreme inaccuracy, stopping early, disconnecting regularly, ... Abbott are very good at replacing these if you report them. I have found the online form (available on the Freestyle Libre website) very good for this. I recently received a replacement within less than a week.</p><p></p><p></p><p>It depends. Given the "limitations" above the advice is usually to finger prick if the reading does not reflect how you feel or if high or low. </p><p>I tend to check once a day when my levels are in range and reasonably stable. This gives me peace of mind that the sensor has not gone astray. </p><p></p><p></p><p>Very very rarely - only when my BG is above 15. </p><p></p><p></p><p>Absolutely and you are doing great asking brilliant questions so that diabetes does not take over your life. </p><p>If you have a certain type of mind, the learning curve can never stop as new technology and treatments are constantly coming available.</p></blockquote><p></p>
[QUOTE="In Response, post: 2679951, member: 527103"] Both LIbre and finger pricks conform to a standard which allows +/-15% accuracy. So depending upon your levels, the difference between the two may vary. For example, if your "real" BG was 10, your two meters could independently report anything between 8.5 and 11.5. Therefore, a usual" difference of 1 is within this tolerance. However, there are a few other things to consider - insertion trauma - some people find that their body takes 24 to 48 hours to adjust to an alien object inserted in their arm. During this period, the readings may app[ear random. If you experience this, it is common to apply your new sensor a day before starting it. In your other arm, obviously. - compression low - if you apply pressure to a sensor, it will block of the flow of fluid to the sensor. As a result, you may receive a false low. This is most common at night when you may lie on your arm with your sensor. - interstitial fluid delay affect - CGMs like Libre do not read blood glucose. They read interstitial fluid and use an algorithm to convert this to a BG reading. A change in BG will be reflected in the interstitial fluid reading after about 10 minutes. The algorithm used will take this into consideration by extrapolating the current trend. This is great most of the time. However, if your BG trend has changed in the last 10 minutes, the extrapolation will be incorrect. This is most commonly observed when recovering from a treated hypo - your Libre will suggest it takes longer to recover. - highs and lows - CGMs like Libre are designed to be most accurate at "normal" levels which is typically between about 4 and 9. Outside of this range, they may have a tendency to exaggerate highs and lows. Therefore, it is recommended to check a high or low with a finger prick before correcting. If you are experiencing an obvious hypo, there is no need to double check. - factory calibration - cheaper CGMs likes Libre and Dexcom One are factory calibrated with no option for home calibration against your finger pricks. This is fine for most people but some of us find that we are slightly different to "factory man". There are unofficial apps like xDrip+ on Android and Shuggah on iPhone which allow calibration (and other features). The possible downside is that these do not upload your readings to LibreView for your DSN to review. - faulty sensors - unfortunately, some sensors are faulty. This may be extreme inaccuracy, stopping early, disconnecting regularly, ... Abbott are very good at replacing these if you report them. I have found the online form (available on the Freestyle Libre website) very good for this. I recently received a replacement within less than a week. It depends. Given the "limitations" above the advice is usually to finger prick if the reading does not reflect how you feel or if high or low. I tend to check once a day when my levels are in range and reasonably stable. This gives me peace of mind that the sensor has not gone astray. Very very rarely - only when my BG is above 15. Absolutely and you are doing great asking brilliant questions so that diabetes does not take over your life. If you have a certain type of mind, the learning curve can never stop as new technology and treatments are constantly coming available. [/QUOTE]
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