WTF is CGM Sensor Soaking?

I saw an Instagram story a few weeks back that intrigued me.

In it, a friend of mine was talking about how she “soaks” her CGM sensors. Instantly, I was confused: What the heck did she mean by that? Soaks them in what, hot water or some other liquid?

HUGGING THE CACTUS - A T1D BLOG
Contrary to the connotation of the word “soaking”, this does not mean you’ll be submerging your CGM in any sort of liquid.

Within seconds, her definition of “soaking” became much clearer. “Soaking” a CGM sensor means inserting a fresh sensor hours before you intend to activate it. Rather than giving your sensor just two hours to warm-up, you’re giving it 4-6 hours so it can supposedly provide much more accurate readings immediately after the warm-up period has ended.

I was interested in this practice because I’ve definitely experienced sensors that were off for several hours post-insertion/warm-up. Sometimes, it even takes a full day for a sensor to start reporting accurate numbers, and I wouldn’t exactly call that efficient.

While I haven’t had the guts to actually try sensor soaking yet – I’d like to sometime in the near future – I’ve been doing some research on it so I’m fully prepared to try it whenever I’d like. Here are some questions I had about the process, and the answers I’ve found to them:

Q: Doesn’t this mean that you’re wearing two sensors at once?
A: Yes. But it’s only for a short window of time, until the old sensor expires and it’s time to activate the new one; in other words, for the full soaking period.

Q: How long should I let a new sensor soak?
A: According to what I’ve found online, it seems that 4 to 6 hours is the sweet spot for soaking. It’s basically doubling or tripling the built-in warm-up period that all sensors must go through, so I can see how this might contribute to improving immediate accuracy.

Q: How do I protect the new sensor if it doesn’t have a transmitter snapped in it for several hours?
A: The reason why I haven’t tried soaking yet is because I was worried about wearing a sensor that didn’t have a transmitter snapped in it. But I found some photos online of people who wore transmitter-less sensors with stretchy, self-adhesive wrap tape to protect the nook in which transmitters rest for the soaking period. It’s smart to protect that space, because in theory, it could be vulnerable to catching on clothing or other surfaces. Plus, tape like that is really easy to remove without damaging the sensor in the process.

Q: What changes about the sensor activation process when it’s finally time to start the new soaked sensor?
A: My research leads me to believe that nothing really changes at the end of the soaking period/when it’s time to activate the soaked sensor. All that will be needed is the sensor code so it can be properly activated within the receiver/Dexcom app. So the most important thing you can do at the very start of the soaking period is hold onto your sensor code/store it somewhere safe so you’ll be able to enter it at the end.

Q: So…why would anyone bother trying this again?
A: My understanding is that it all relates back to making sure a fresh sensor is as accurate as possible once it’s activated. I can’t tell you how many times I’ve put on a new sensor, only to discover a few hours after it has warmed up that it’s off by 40 or 50 points – and that just doesn’t cut it. So I don’t think there’s any harm in me giving sensor soaking a shot one of these days. I just have to remember to do it, and have the patience to wear three devices at once (my pod, the soon-to-expire sensor, and the new soaking sensor).

Have you tried soaking? If so, please drop a comment and let me know your thoughts on it – and be sure to tell me if I missed any key steps in my research!

Advertisements

Third Time’s the Charm: Here’s How I Restarted My Dexcom G6

You GUYS! I finally did it! I managed to restart my Dexcom G6. Sometimes, a little bit of trial and error pays off.

I restarted it by following the exact same steps that I linked to in my post from a few weeks ago. It involved five simple things:

  1. Allowing my sensor to expire and remain on my body
  2. Starting a new sensor session and choosing “no code” when prompted
  3. Running the 2-hour warm-up session for only 15 minutes, then stopping it
  4. Starting a new sensor session again, without a code (if you still have the code, though, that you used when you first inserted the sensor, then enter that into your receiver/app. But don’t make up a code or enter one from another sensor – just say “no code” if you don’t have it)
  5. Allowing the 2-hour warm-up session to take place and receiving readings once it’s complete

The only thing that was different between this time and last time was the steps leading up to the restart. What do I mean by that? Well, for starters, I made sure I was attempting to restart a sensor that was giving steady, reliable readings – it seems as though it’s impossible to restart a sensor if it’s experienced any sort of error in the 10 days it’s been worn. So this means that when the sensor expired, I’d been receiving readings consistently up until the moment it expired.

afd124d9-95d7-48be-b5dd-7445fc6efdd2
That gap represents the sensor’s second round of two-hour warm-up.

That was the main difference. The location of the sensor I restarted was the back of my arm, which may or may not have affected the restart. I also restarted without using the sensor code, which I had set aside to use but somehow misplaced prior to the attempt. I have no idea if having or not having the code makes the restart more or less successful, but I do know for sure that I got three more full days of use out of my sensor. Cumulatively, that means that I was able to wear the same sensor for almost two full weeks! It might not seem like a lot to the marathoners who are able to make older G5 sensors last 3-4 weeks (I’ve even heard of people keeping the same one on and working for 6 weeks), but it’s exciting to me to have confirmation that it IS at least possible to restart a G6 sensor.

In terms of the sensor accuracy, dare I say that it was even MORE accurate on the second go?! I don’t have proof to really back that up, but honestly, it seemed that it was right on point with all my blood sugar readings (within 5-10 mg/dL). I don’t know how to explain that, but no complaints about it here.

The only other difference that was noticeable during the sensor extension was that I was prompted to calibrate at least every 12 hours. No big deal, since I had to do that when I was on the G5. But it caught me off-guard a bit at first, because on both my receiver and within the Dexcom app, a small blood drop icon was always visible onscreen (when actively checking the app or the receiver). Initally, it wasn’t too alarming because it was merely a reminder to calibrate twice daily. But then it became an absolute nuisance when weird “calibrate after __ A.M./P.M.” messages occurred multiple times per day. I would check my blood sugar at the appropriate time and enter the result into my app/receiver, only for it to be rejected and trigger another specific time-calibration message.

To me, that indicated that my sensor’s second go-around ought to come to anend sooner rather than later. It was getting obnoxious to have to wait and check my blood sugar manually in order to appease the Dexcom messages that kept popping up. Plus, it came down to my comfort levels with wearing a sensor for a certain length of time – I just don’t love the idea of keeping the same one on for ages.

But this was my first taste of success with restarting a sensor, so naturally, I want more of the same! I’ll definitely continue to try to extend the life of future sensors, but remember, follow the steps above at your own risk. When in doubt, simply follow protocols as outlined by Dexcom. If I experience an even more successful sensor extension, you can bet that I’ll have all the details to share with you all here.