There is a variation cos the libre (and other CGM's) use interstitial fluid to work out your sugar level rather than your blood and whilst it can get very similar results it is not always - there is extra some info here: https://freestylediabetes.co.uk/freestyle-libre/flash-glucose-monitoring-tempWhich one should I trust & why is there a variation?
Great thanks.The blood test meter is deemed to be more accurate, so should be trusted over the libre.
There is a variation cos the libre (and other CGM's) use interstitial fluid to work out your sugar level rather than your blood and whilst it can get very similar results it is not always - there is extra some info here: https://freestylediabetes.co.uk/freestyle-libre/flash-glucose-monitoring-temp
For me the libre always seemed to show about 1ish mmol/L below my blood glucose meter
There are loads of threads about Libre (the Search function on the top right of the page will help you find them).I also think the Libre readings are what your BM will show in 30 minutes or so.
the algorithm Libre 2 uses