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Message: <blockquote data-quote="Bittern" data-source="post: 2511626" data-attributes="member: 315804">As said above meters have an accuracy tolerance of +/-15%, what this means in practice is a reading of 10 may actually be 11.5 or 8.7 or anything in-between. So a reading of 17 could be 19.6 or 14.7 or anything in between.The first problem you have comparing meters and Libra is that the Libra also has a an accuracy tolerance, say +/-15%, I don't have the actual figure to hand, so if your meter is at the lower end of its tolerance, say -15%, and the Libra is at the higher end of its tolerance +15%, the difference in readings could be 30% which is still within the manufactured allowed tolerances, ie the meter can read 11.5 Libra reads 8.7.The second problem is that blood glucose can vary very rapidly so readings taken seconds apart can be different. even using the same meter.The third problem is that a meter and a Libra do not measure the same thing. The meter reads, fairly directly, the level of glucose in the blood and the Libra reads the level of glucose in the fluids between the cells at the site of the Libra and then corrects that number to blood glucose using a built in algorithm.The fourth problem is that the glucose level in your blood, read by a meter, will vary much faster than the interstitial glucose readings taken with a Libra, thats just the way your body works. So the Libra reading is likely to lag the meter reading.My advice for what it's worth is find a meter that you like or the NHS will give you and stick to it, using the Libra readings to look for trends in levels over time.Sorry for the long post but I hope it explains things a bit.</blockquote>

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