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Permalink Reply by Dave on November 12, 2010 at 9:15am

Hi,

I just got off the phone with Dexcom concerning their advice about what to do with inaccurate or failing sensors. They told me to enter three blood glucose values 15 minutes apart, 3 hours after the ??? appears. They told me not to restart their sensors (something that I'm sure most users would disagree with).

I had a sensor that was giving me wildly inaccurate readings (from 40 to 400) when my blood glucose levels were between 75 and 110 when measured by a One Touch Meter. I ended up restarting the sensor twice, before I finally trashed it in the middle of the night because the low blood glucose alarm was going off every 5 minutes despite the fact that my glucose was in the normal range.

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Permalink Reply by FHS on November 12, 2010 at 10:25am

I never used to restart my sensor but, after some discussion over at the Dexcom forum regarding the ??? issue, I have decided to start looking at the state of the transmitter before trashing the sensor. My last sensor started returning ??? after 10 days, which is a good run but not typical. When I removed the sensor, like others, I noticed some moisture underneath the transmitter.

Next time this happens, I'll try cleaning the transmitter first before I trash the sensor.

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Permalink Reply by Terry Keelan on November 12, 2010 at 11:10am

I would probably just restart the sensor. But thinking on it more, if you can remove the transmitter without disturbing the insertion site, wipe it off and put it back before restarting - why not give it a try?

Terry

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