Libre 2 Plus - Worsening variation between sensor readings and glucose meter readings after around 8 days

[mariavontrapp]

Since switching to libre 2 plus, I haven't had a single CGM that has been close to my finger prick tests. My CGMs are consistently showing readings between 1 and 2 mmol lower. It's really annoying when the CGM gives you a false sense of glucose control

 

[saucequery]

Yup, agreed @mariavontrapp
Things that seem to make it wonkier: sunshine, walking more than 2 minutes, being horizontal, * looking * at a packet of biscuits....

I read this recently and it was a good reminder not to rely solely on CGMs

Diabetic ketoacidosis due to a sensor defect of FreeStyle Libre: A case report - PMC

The FreeStyle Libre Flash Glucose Monitoring System allows users to obtain sensor glucose values by scanning with the reader or their mobile phone. We report a case of a 59‐year‐old man with type 1 diabetes mellitus who developed diabetic ...

pmc.ncbi.nlm.nih.gov

 

[saucequery]

^ having said that, I've realised that using hand sanitizer to clean my finger for a "proper" test when out and about isn't really working as well as I'd thought - thought to double check at home this afternoon when my libre showed 3.7, and got a 5.3 with hand sanitizer (ha! Libre discrepancy!), then properly washed my hands and got a 3.6.
Face, meet palm...

 

[saucequery]

Libre 2+ was reading 3 units lower than a properly-washed-hands fingerprick this morning; 4 units lower an hour ago, 4.5 units lower just now (on day 8 of wearing). Ridiculous.