I just got a new blood test thing, contour next, and I compared it to my old one, accu check.
After lunch the new one read 11.5 mmol while the old one read 10.8. That was actually taken from the same drop of blood.
I’ll repeat this for a few days to get a feel of how the new one is working but it r
If it makes you feel any better, this kind of thing gets asked and answered here almost daily - it drives many of us crazy.
Blood glucose monitors have to be within something like 15% of a lab draw 90% of the time, iirc. So there's a significant margin of error, and 10.8 - 11.5 is not a huge difference.
Even taking readings one after the other, your glucose is not distributed 100% evenly across your entire bloodstream, so there will be differences.
Since your CGM is making an estimate of your glucose based on your interstitial fluid and not your blood, A) it's not going to be exact all the time, and B) it's going to be detecting changes to your glucose on a delay from what your blood will show.
Even a lab a1c test can have a margin of error of as much as .5, I believe.
All of this, plus: what would we do differently in our treatment, if all the meters read exactly the same? That 10-20% margin of error has been fine for decades of diabetics managing diabetes. It’s like every new person diagnosed imagines a need for mathematic precision that just…has nothing to do with reality.
Sorry, don’t mean to drive you crazy 😜 I only recently discovered this sub Reddit. But thanks for your answer.
Oh, I meant that the problem drives many people crazy, not that people keep asking. Sorry if that wasn't clear!
Searches first are a good thing.