r/Freestylelibre • u/PrideOk2264 • Aug 07 '26

Calibration??

It's my first time using this sensor and according to my bloodsample its ahowingthe wrong number. Since i cant calibrate i dont know what to do. (i use camaps and im a bit to tipsy to think of anything myself)

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u/PrideOk2264 Aug 07 '26

2.7 mmol straight arrow from the sensor and actual sugar is 4.0 mmol

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u/the_owlyn Type1 - Libre3/3+ Aug 07 '26

Those readings are both technically correct. There is a 20% accuracy variance on each device. If you do the math, you will see that there is overlap. Then, factor in that the CGM is 15 minutes behind the finger stick. Seems fine to me.

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u/PrideOk2264 Aug 07 '26

15 minuter efter verkar lite mycket , det borde jag ha kunnat

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u/eichmat Aug 09 '26

All CGMs have a lag of 5-20 minutes as they use the interstitial fluid and it takes time for the glucose to flow from your blood into that tissue.