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Message: <blockquote data-quote="HairySmurf" data-source="post: 2719072" data-attributes="member: 583820">Very probable that the Libre 2 is giving you inaccurate readings.  You might have been unlucky and gotten bad replacement sensors or there might be some other factor involved.  It is very highly unlikely that two finger prick meters would both become inaccurate at the same time and yet (roughly) agree with one another.  I've experienced similar problems with the Libre 2.If you'd like to be certain you can get control solution from a pharmacy for testing your finger prick meters.  Not sure about the Accucheck, but the Contour Next requires special control solution made specifically for that meter.  You shake the bottle well, put a drop of control solution on a clean non-absorbent surface (I used a piece of plastic), test that with the meter as if it were a drop of blood and the meter gives you a reading.  Each pot of test strips has a control range printed on it.  If the solution gives you a result in that range, the meter and the pot of test strips are good.  I repeated the control test a few times and found that the meter would typically give a reading right in the middle of the control range - i.e. close to true objective accuracy, on average.  A couple of studies from a few years ago comparing the accuracy of many finger prick meters found that the Contour Next was the most objectively accurate meter available at that time (2017, 2018).  Short of going to a doctor and asking for a fasting blood glucose test to be checked in a lab, testing one or both of your finger prick meters would be good enough I think, especially if they both roughly agree with each other.  My pharmacy actually ordered and gave me the Contour Next control solution for free.  I'm not sure if that applies in the UK - in Ireland all diabetics get access to a long term illness scheme that pays the cost of certain medications and supplies in full.  If it's not free in the UK it's not likely to be very expensive.I've tried investigating the reasons a CGM can become inaccurate and found little information.  Perhaps something about hydration - how much fluid is in the fatty tissue the sensor filament sits in?  Perhaps changes in the volume of fatty tissue in that location?  Nobody seems to know for sure, and Abbott aren't exactly forthcoming about the causes of issues with sensor accuracy.</blockquote>

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