I've lurked for a while, but just joined up, mainly because I have noticed an irritating trend with my Dexcom.
I've had the Dexcom for about a year now, and it's generally been good. I always insert in the morning (always in my belly), and try to keep my sugars stable during the startup period. I only calibrate when sugars are stable, and never in the morning (to give it time to normalize after I've rolled around on it all night :-) I almost always do 2 finger sticks to make sure my meter reading is accurate before inputing a cal value into the dexcom. The only thing I do that is a little sketchy is that I am often in meetings when the initial cal period ends, so I sometimes wait to input the initial two readings for up to 2 hours after the unit starts buzzing.
The problem is that a new sensor always runs high for the first 3 or 4 days of the cycle. This particular one took 5 days... Every time I calibrate it's running high.
After 3 or 4 days, it is generally accurate, and if I restart it continues to be accurate into week 2, so it seems to be something specific to the sensor rather than the computer. This is anecdotal, though, since I rarely re-start, usually I just pull it at day 7 and start a new one a day or two later.
Anyone else notice this? Perhaps there's some known fix for it?
Thanks in advance!