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The Libre is factory calibrated.Wow. First morning readings. 8.2!!!! on the libre but 6.1on my accuchek mobile (taken 12 mins earlier to account for the time delay in interstitial). That’s a big discrepancy imo.
Unfortunately, not everyone's interstitial fluid is the same as the factory calibration. I found I was regularly out.
The Libre Reader and LibreLink provide no option to calibrate against a finger prick reading. However, there are some free phone apps which use a different algorithm to convert interstitial fluid reading to BG reading and they take into consideration a calibration finger prick reading. I use an app called Glimp which does this and the readings are much much closer to my finger prick. The LibreLink app is still needed to activate the sensor bur once activated, you can switch between the two ... and compare the two if you want.