Medtronic 670G Sensors Not Lasting Full 7 Days

[DanP]

As others have mentioned, wild swings in BG can cause this. Also, when starting a new sensor, if youre high, it can cause problems. This brings up the topic of ISIG. I suggest searching the forum for this and reading up on it. Here’s a couple threads on the subject:

Please explain low ISIG values on the MM CGMS:)

I just inserted a new sensor and it will not work…keeps alarming (Lost Sensor, Bad Sensor) and the ISIG values are below 5! I started on the sensor w/o training and can find no details about interpreting ISIG values…mine have been low (less than 15 most of the time) w/ the previous 3 sensors yet they managed to work and track most of the time. I have done everything…checked the transmitter (ok)…although I wonder if it is tip, top. It is over a year old although sat in the box most of the time. A…

ISIG # where is it?

I have seen notes that said "use the escape arrow to look at the sensor status screen (the one that tells you the age of the sensor), you will see a line that says "ISIG" and then a number." I don't know where I copied this from and put in my cgm tip sheet. However, I do not see an 'escape arrow' (I presume on the Dex?) on the Dex or anywhere else. One person said it was on the bg meter but there is not one on mine. Can someone tell me in plain English where is the ISIG number (on which machine?…

Additionally, I have found when the little flexible part that is inserted into your body get bent, kinked, or otherwise interrupted, it can cause this issue as well.