I am a new CGMS (Medtronic) user. I have successfully set my sensor up. It transmitts data to my pump with no issues. I calibrate it well within the recommended timelines (6 hours after the first calibration and 12 hours thereafter). I get pretty decent correlation for the first half hour or so, but no real correlation after that. My readings are as close as 40 mg/dl and as far off as 150 mg/dl. Neither is useful, even for trend data. And the descrepancy goes either way. I’ve had CGMS readings saying I was 130 after a meal and a finger stick that was 245. Ouch! I wanted the CGMS to catch these undiscovered highs in the first place. I’ve also had CGMS readings at 110, felt low, tested and my finger stick was 55. No good!
I have gone so far as to ensure I have no active insulin or converting carbs for the full 2 hours that the new sensor is starting and certainly when I calibrate. My ISIG values are typicaly around 12 (give or take a few points). I don’t know enough about how these operate to know if this is a problem, but I’m wondering because the testor is expected to produce ISIG values between 24 and 29. Also, anyone know what’s going on in that 2 hour period when you start a new sensor?
It looks like others had similar issues from the ‘120 point difference…’ thread, but the issues ultimately cleared. What fixed it for you?
I would really like this to work. Any pointers?