I know the BG readings are "relative" to the inputted readings (calibrations), but am wondering if anyone knows more than that. For instance, are BG readings relative to the previous reading (5 minutes ago in the case of Dexcom), or are they all relative to the most recent calibration? Said another way, does being "out of range" for any period of time compromise CGM accuracy? My son was out of range for 2 hours the other day. When he came back in range, I assumed the number would be way off. But I pricked his finger and the CGM was spot on. Was that just a coincidence? If relative BG readings are based off of the most recent calibration, then it was not a coincidence. If they're based off of the most recent reading, then it was. Hope that makes sense. Just wondering if anyone has any insights. Thanks.