Dexcom G4: Exercising my Demons.
There aren't any stupid questions. Or so I was told by every teacher in every classroom, growing up. But I think the Dexcom is the exception to that rule.
Because when it asks me "???" with that blank look on its screen, I can only throw my hands in the air and say, "WHAT? What is your question?!"
With the Seven Plus system, I had my fair share of the Triple Question Marks. Usually they signaled that a sensor was about to give up, or that something else was en route to borked. But for the last month on the G4, I hadn't seen the dreaded triples.
Until last night.
While I was at the gym, with the Dexcom receiver sitting safely on the treadmill shelf, the receiver showed the "lost signal" icon. Which, according to sources, means that I'm "out of receiver range," meaning I'm too far from the receiver, meaning I'm not even close to it. Meaning that I'm totally confused because the transmitter and sensor were less than three feet from the receiver when it claims to have lost the signal.
Meaning that I was extra frustrated when my meter showed a 50 mg/dL before driving home after my workout. Symptom-free lows plus a questioning Dexcom receiver equals frustration. (That's pretty much the only kind of math I can do, right there.)
This has happened a few times for me at the gym, while on the treadmill specifically, but the Dexcom usually "finds" me soon enough and my numbers reappear on the graph. Last night, however, the Dexcom oscillated between the lost signal and triple question marks for my entire workout. And it didn't sort itself out until about midnight ... five hours after going rogue.
But all night long? Totally fine. And all day, so far? Also fine. Is it the treadmill that's making the G4 go berserk? Does the new system hate running? (I can't blame it, if that's the case. I hate running, too.) Is this sensor a fickle one? Does this happen to other people while they're at the gym? Is it the friction of my clothes against the transmitter? Is it something about the treadmill itself? What can I do to prevent it? Will Batman escape the machine before being turned into mashed potatoes?
Or is that just a stupid question? (???)