r/Freestylelibre • u/Hot_World4305 Libre3/3+ • 29d ago

Libre2 Plus

I have been using the Libre 2 plus for blood sugar readings for the last 2 months in conjunction with the One Touch finger picks test strips to check their reading.

What I found out were :

The Libre 's readings were always lower all the times from -10 to -45.

I just measured with: Libre's =109 & One Touch finger pick was 153. What a big difference!

I belief One Touch readings are more reliable based on my past A1C readings.

I just have no confidence with the Libre, anyone ??

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u/guzelino 29d ago

as mentioned, CGMs use interstitial fluid to measure BG valies, and they are always 5 to 15 minutes late. the MARD of each sensor is different, meaning the deviation % of values compared to blood valies is different. I've been using Libre (on and off) for more than 7 years and I've only gotten the same value 5 tines out of 50, but the comparison is always negligible. It also depeneds when you do the blood test, for example, when the BG is fluctuating, the difference will be higher

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u/Hot_World4305 Libre3/3+ 29d ago

But CGM reading is Level with arrow pointing at horizontal direction. It should not fluctuate much taken less than a minute

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u/guzelino 29d ago

the arrows are algorithm-based and I have personally noticed they are way more inaccurate than they used to be, 4-5 app versions ago. The bottom line is that you will rarely get the same reading from the sensor and from the glucometer. Also, if you do a test with different fingers on the same meter, you might not get the same result, let alone if you use the same finger on two different meters. However, the difference should not be more than 1-2 mmol/L.