I've been using OmniPod for two months and have been a Dexcom G4 user for about year and a half. Prior to getting onto OmniPod I used to calibrate my Dexcom from fingerstick readings taken from OneTouch glucometer. But now that I have the PDM with me all the time, I use its built-in glucometer for fingerstick readings.
What I've been noticing is that my Dexcom readings drift a lot more from the fingerstick readings when compared to the Onetouch glucometer. Onetouch and Dexcom readings were almost always very close to each other (+/- 10 points), but that's not the case with PDM & Dexom readings.
I test BG on Omnipod PDM 3-4 times a day and the reading is usually 20-25 points higher than what my Dexcom shows. I re-calibrate the Dexcom every time but it drifts +/- 20 points in next 3-4 hours.
I'm not sure what's the reason for the difference in these values? The possibilities are
1) My Dexcom is misbehaving and not able to track the BG closely even after multiple calibrations
2) OmniPod PDM is showing incorrect BG values
3) The error ratio of Dexcom and OneTouch is similar
Anybody experiencing similar issue? I know that conventional wisdom is to always trust your fingerstick value, but do you trust one glucometer over the other?
I have to be able to trust a device to keep my sanity :).