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Message: <blockquote data-quote="Jasmin2000" data-source="post: 2684250" data-attributes="member: 582816">Hi [USER=566718]@Nick25[/USER] - A1c on the Libre is estimated using the continuous monitoring figures - not just your scans. The Hb in HbA1c is hemoglobin and the blood test measures how many glucose units have stuck to your Hb during the last 3 months to make glycated-Hb. The blood lab can quantify glycated-Hb and gives you an HbA1c value.Libre sensor does not measure anything in blood and has no idea what your glycated-Hb looks like, so they developed an algorithm to estimate A1c (the Glucose Management Indicator, GMI). GMI estimates A1C based on the average glucose level from the continuous monitoring sensor readings during the report period. This is what you see on the Libre under "Estimated A1c"The Estimated (GMI) value and the true blood HbA1c are rarely the same and a 20-35% difference is not unusual (my Libre A1c is 4.8% but my blood A1c is 5.7%)..Could be either - I would check your Libre after the BG value and see if it appears later. This lag is well known and can be a few minutes to >20 minutes. I've tracked BG and Sensor readings in parallel after an outragous carb intake (a honey croissant - but all in the name of science!). BG rose to 13 over 60 mins and the Libre followed but was 5-10 mins behind.If yous suspect an underreading then you should check the position and seal of the sensor and/or do the BG test again with a different finger. The best time to check is when you have a stable BG over 30 min as this should be reflected on the Libre.</blockquote>

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