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Message: <blockquote data-quote="Oldvatr" data-source="post: 1638897" data-attributes="member: 196898">The accuracy for bgl meters is regulated by needing to adhere to the ISO standard for these meters.  Since 2016, new meters are required to demonstrate that they give readings within +/- 15% of reading, so are allowed larger errors between meter readings as the glucose value increases.  So for a reading of 10 mmol/l. then a meter is accurate with result in the range [10 -1.5] to [10+1.5] mmol/l, so a variance of 3 mmol/l between successive readings is considered accurate at that bgl value, and even between two meters testing the same drop of blood at the same time.  Meters supplied before 2016 had even worse ISO limits.Fact of life I'm afraid.</blockquote>

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