I have a Dexcom that I am not currently using, but I loved it when I was! It isn’t something that you can stop testing with because readings can be off, but they are supposed to be within 20%. If you have a bad sensor, they will replace it. I was very aggressive with alarm setting and had my low set at 70 and high at 120 – I wore out alarms in two of them! The negative for me was that I could never hear the alarms at night.
There is a Dexcom group here so I suggest joining if you haven’t yet and read back thru some of the tips.
You are supposed to calibrate twice a day but can do more or skip. Quality is better than quantity and one of the things I learned in the Dexcom group was to make sure you BS is stable for 15 or 20 minutes before doing a calibration. Dexcom will take the calibration if you aren’t but you can get better readings if you are so it is better to wait it out.
If you are dehydrated, that can throw off readings so try to make sure you are drinking enough if you tend to run dry.
You probably know that you can’t use Tylenol with it and there are a bunch of things that have Acetaminophen in than just Tylenol, especially cold meds. That will really send the sensor off on a wild tangent! You can turn the Dex off without disturbing the sensor and turn it back on without having to wait 2 hours so if you need to take that stuff, it is better to turn the Dex off.