Help with New Dexcom G4 CGM

Hi everyone!

After 34 years of finger sticks I recently bought the Dexcom G4 CGM! So far, so good…I have far less anxiety about my bgs throughout the day. I would be interested to hear feedback/advice about day to day use - e.g. best way to calibrate, how many times, placement,tape, sensor life, etc. I’m paying for it out of pocket so the more accurate it is, the better! There’s a tremendous amount of user experience and feedback out there, hard to always know what to follow.

Thanks everyone!


I have found the Dexcom is most accurate with only 2 calibrations per day - the Dex will tell you when with the drop of blood icon on the screen…calibrating too frequently or if your trend arrows are not level can mess up the accuracy.
I have been able to get 14 days out of a sensor - you just stop the session and restart it (I would be able to get more but the tape starts to fall off, and I get a rash if I wear it too long). Some people add Opsite Flexifit tape to get even more time - but again I get skin issues so that does not work for me.
The best way to prep I have found is to use Sensicare skin barrier spray and then Skin Tac adhesive before attaching the sensor.
Good luck - I have found it to be the best tool I have for managing my T1D - even more than pump.

Been on my g4 for 2 months now. I have been getting 2 weeks out of each sensor with absolutely no problems.

Hi Janlb,
Thanks for the message and support. I make sure to let the ROC arrow settle before any calibration. Two makes would be great per sensor, more would be even better! I will look into that tape - I’ve reached the end of week one and haven’t needed any extra adhesive in addition to the skintac I used with the original sensor adhesive.

Thanks again!

Hey Hannerstim,
This is great to know, I’ve just reached end of week one, no problems as of yet, fingers crossed!

Dexcom G4 CGM Comments/Remarks:

I started on the Dexcom G4 sensor, and was upgraded to a G4 with Share. I found that if I had my preference, I would prefer to have an option to either continue with the “old” transmitter to receiver method, meaning non-Bluetooth, which I learned does not drain the battery as fast, or Bluetooth. I now have a G5 receiver and transmitter.

I use the receiver for my device, and not my smart phone, so this might just be my choice.

As for user comments, I like the product, and find the twice daily calibrations easy to do, and think that their readings generally agree with the number I get on my meter.

The 14 day suggestion is one I have not tried. This is because of what I have learned from my pump sites. I think that anything you have to place (or inject) through your skin, can become a possible site for infection. I cannot hope to presume how you react to things that a injected into your body and attached, but, an infection is something I try to avoid, and by removing something after 7 days, this sorks for me.

Again, as insurance coverage varies, and I get 4 sensors per month, with no additional charges for me, and due to the fact that Dexcom will replace a sensor that does not last me for the full 7 days (at no charge), I do not need to stretch the sensor usage.

Just my two cents … my opinion … I hope this helps.