I usually use the OneTouch Ultra glucometer. Recently, I got a Sanofi BGStar glucometer. The first pair of parallel tests (on different days) were a bit of a shock. I washed my hands for each test.
Ultra 5.8 BGStar 7.1 (+22.4%)
Ultra 5.4 BGStar 6.9 (+27.8%)
I know that you can drive yourself nuts comparing meters. Stop me before I test again.
I'm taking a truck load of different supplements because the treatment I am having depletes a lot of good stuff. I am also slightly anemic. Could something like this account for the discrepancy? Does the BGStar have to align with Polaris? LOL. The only other meter that I found giving consistently higher reading was the Abbot Precision Xtra by about 0.5 mmol/L every time. I don't have any calibration fluid for any meter. Maybe I should do tests on my partner.
One thing for sure. If I use the BGStar, my A1c will drop like a stone.