Because so many people run their Dexcom sensors longer than 7 days, at some point people may wonder about using old sensors that have passed their expiration date. (See: expired-dexcom-sensors)
No worries, I like trying expired stuff!
So I gave a try to some old sensors which expired 10/2016. If you look at a box of new sensors you recently got, you will see that the expiration date is probably over a year away, so that gives you an idea of how old these actually are.
These are the older G4 sensors. As you know, the G4 and G5 sensors are the same, but these came from a box that didn’t even have the G5 listed on it. These sensors were made before the G5 had been released.
How did they do?
As you may know, I am not a huge CGM fanboy, because sometimes they lag too much or have flaky numbers for me. But these sensors worked fine. I had no complaints. I didn’t notice any loss of accuracy from the new ones I usually use.
I had one sensor that got botched, I was getting strange values from it, but when I removed the transmitter I noticed that the sensor was completely filled with blood. So the problem was not the sensor.
Incidentally, I called Dexcom to report it and I told them it was an expired sensor, and they apologized but said they can’t replace expired sensors. I am not going to game Dexcom for a free sensor, I just wanted to see their policy on replacing expired sensors to provide the information to everyone. They did not ask me if it was expired, I volunteered the information to see their response. Just so you know, they will not replace them. It’s actually the first time they haven’t replaced something for me!
Anyway, for anyone wondering, expired sensors seem to work fine.
A special word of thanks to a New York swimmer for her role in this test. Thanks for the expired sensors, DM! Now get back in the pool!