Thought I’d do a separate thread on this since it has come up in a couple of discussions. As we know, the new Dexcom G6 transmitters, with SN’s starting with 8G, are designed to prevent sensor restarts. They do this by checking for “insertion trauma”: if the BG track is too steady during the 2hr warm-up period, the new algorithm deems it an attempted a restart and invalidates the sensor. The concern this raises is, what about doing a pre-soak before initiating a legitimately new sensor? The point of pre-soaking (inserting the new sensor while the old one is still running, and giving it 12-24 hrs before swapping over the transmitter) is precisely to allow it to acclimate and thus ameliorate the erratic readings we often see for the first 12-24 hours of a new session. So there’s been a question whether doing a presoak would result in the system invalidating the sensor because it doesn’t see the “insertion trauma” it’s looking for.
I’ve now done two pre-soak sensor insertions on 8G transmitter.
First one (ten days ago):
Pre-soak, 12 hrs.
Result: no invalidation
Sensor Behavior: not very effective—I had erratic readings for the first 12 hrs, then it settled down.
Second one (today):
Pre-soak, 16 hrs
Result: No invalidation.
Sensor Behavior: Starting off kinda flakey. How do you get an initial post-warm up data point with a sharp down arrow? I mean, down compared to what? It was also 25 pts high compared to a finger stick, and so what the hey, I calibrated. Came down, but now it’s trending back up again.***
So… we’ll see how the next several hours go. When I’ve done pre-soak before, it has seemed more effective than this. Could be just random, could be there’s something about the new algorithm that is making this technique less effective than it was. If I get the same erratic readings for the next 12hrs that I got last time, I may not bother doing it again. Since it does seem safe to try, I’d like to see what results anyone else gets.
***ETA: as it turns out, it actually settled down in less than an hour and has been spot on ever since.