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So hey - #DOC folks who use CGMs, especially M*dtronic ones? Does everyone out there know what ISIG values are and how to compare them to your fingerstick BGs to make sure your calibrations won't reject, especially with a newly inserted sensor?
Seems a lot of us were never clued into these by our trainers and doctors when starting CGMs, which is probably why the urge to through your damn pump against the wall when every other sensor rejects is such a common one.
In a nutshell - if you go to your sensor status screen on your 670g (I'm assuming it's the same on other pumps, but this is the one I have), it'll tell you the ISIG (interstitial signal) value. You'll get that even if you're waiting
to calibrate and aren't getting a reading from your sensor.
Take your current BG from a fingerstick, divide it by your ISIG value, and if the result is between 3 and 8 your calibration *should* take. If it's outside that range (and for me it often is for the first *several*
Take your current BG from a fingerstick, divide it by your ISIG value, and if the result is between 3 and 8 your calibration *should* take. If it's outside that range (and for me it often is for the first *several*
hours after I put on a new sensor) the calibration will reject. And as a lot of you know...after two rejections in a row, the f'ing sensor is trashed 
My M*dtronic trainer NEVER advised me on ANY of this when I got my first CGM in 2018. It was a very nice and very patient
My M*dtronic trainer NEVER advised me on ANY of this when I got my first CGM in 2018. It was a very nice and very patient
tech support woman on the helpline who finally clued me in!
This is not me, but this person had a very similar experience and explains how to use the ISIG values very well in their post.
This is not me, but this person had a very similar experience and explains how to use the ISIG values very well in their post.
I'm a no-one in this community so I'm not sure if anyone will see this, but @Kidfears99 , @lollydaggle @jediabetical - I think you guys have a larger following? Maybe you could give this thread a quick RT if you think this info might help other diabetics out there?
