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Test Meters Don't Agree.
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<blockquote data-quote="urbanracer" data-source="post: 2248266" data-attributes="member: 140811"><p>Hi [USER=522326]@LordGrep[/USER]</p><p></p><p>Your meter is just a collection of electronic components - it is simply measuring a resistance between 2 terminals. If the input was absolutely identical each time then it would always give the same output.</p><p></p><p>Variability is introduced in the mass manufacture of test strips which contain enzymes that react with the glucose in your blood. A tiny change in the composition (or amount) of the enzymes is going to give you a different reading - hence home glucose measurement systems sold in the EU conform to ISO2013:2016 standard which provides an allowable tolerance range, you can read about that here, <a href="https://www.diabetes.co.uk/blood-glucose-meters/blood-glucose-meter-accuracy.html" target="_blank">https://www.diabetes.co.uk/blood-glucose-meters/blood-glucose-meter-accuracy.html</a></p><p></p><p>If you read that then you will have seen that if your true blood glucose level is above 5.6mmol/l, you enter the +/- 15% tolerance band. And so there is more than 1 way to look at your results.</p><p></p><p>Let's suggest for a moment that your 'true' glucose level is 7mmol/l. Your tolerance band would then be +/- 1.05 (doing sums in my head only) meaning you could conceivably get readings between 6 to 8 mmol. So 1 meter could be high and the other low, your issue doesn't neccessarily point to a 40% error although you seem to be a little outside the 15% range. Arguably, this is covered by the requirement for results to be accurate 95% of the time, and therefore 5% is allowed to be outside of the range.</p><p></p><p>General advice - stick to one meter, look for trends and don't get too hung up on individual readings. The meter which reads lower may be safer from the point of view of preventing hypos - and you will get a clearer idea of which 1 is correct when you have your a1c's done.</p></blockquote><p></p>
[QUOTE="urbanracer, post: 2248266, member: 140811"] Hi [USER=522326]@LordGrep[/USER] Your meter is just a collection of electronic components - it is simply measuring a resistance between 2 terminals. If the input was absolutely identical each time then it would always give the same output. Variability is introduced in the mass manufacture of test strips which contain enzymes that react with the glucose in your blood. A tiny change in the composition (or amount) of the enzymes is going to give you a different reading - hence home glucose measurement systems sold in the EU conform to ISO2013:2016 standard which provides an allowable tolerance range, you can read about that here, [URL]https://www.diabetes.co.uk/blood-glucose-meters/blood-glucose-meter-accuracy.html[/URL] If you read that then you will have seen that if your true blood glucose level is above 5.6mmol/l, you enter the +/- 15% tolerance band. And so there is more than 1 way to look at your results. Let's suggest for a moment that your 'true' glucose level is 7mmol/l. Your tolerance band would then be +/- 1.05 (doing sums in my head only) meaning you could conceivably get readings between 6 to 8 mmol. So 1 meter could be high and the other low, your issue doesn't neccessarily point to a 40% error although you seem to be a little outside the 15% range. Arguably, this is covered by the requirement for results to be accurate 95% of the time, and therefore 5% is allowed to be outside of the range. General advice - stick to one meter, look for trends and don't get too hung up on individual readings. The meter which reads lower may be safer from the point of view of preventing hypos - and you will get a clearer idea of which 1 is correct when you have your a1c's done. [/QUOTE]
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