Ten days come to an end, and the first and most obvious, difference between the Dexcom devices and the rest is immediately obvious.
The Dexcom sensors have come to an end, while the rest keep going until 14 days.
This might not seem like a big issue, but for quite a few people, the ability to know that on the same day of the week, at more or less the same time, they will change their sensor, provides one less thing to worry about.
Sadly this isn’t the case with Dexcom.
And what of the other sensors?
The Aidex and Medtrum remain well attached, and continue to give readings.
The Libre2 fell off within 3 hours, and while I was able to report the issue within 15 hours, the replacement was only sent from the warehouse 9 days later, so there’s no Libre2 data in the final reckoning.
The Glucomen Day also gave up the ghost after 3 days, with the app stopping the sensor session. Glucomen believe it was due to the sensor movement and have issued a replacement, and as I had a spare, I have added that and will at least have some data, if not all, consistent with the same fingerpricks.
Any preliminary view on the Dexcom data?
There’s a fair bit of analysis to do, but we do have some preliminary MARD-F (MARD from Fingerpricks) data.
- Dexcom ONE: 9.7%
- Dexcom G6: 12.1%
There’s also the Mean Relative Difference, which gives a rough indication of bias.
- Dexcom ONE: -2.3%
- Dexcom G6: 8%
In this n=1 experiment, the Dexcom ONE has performed slightly more closely to fingerpricks, whilst showing a tendency to produce values slightly below them. The G6 was further away and tended to produce higher values.
Error grids and 20/20 data will be produced in the final summing up at the end of the experiment.
So can the ONE be restarted?
As the ONE is available on the prescription tariff, there should no longer be a need to restart, however, if you were to find yourself not having a sensor and needing to get readings, then the answer is “Yes, it can be restarted with the Dexcom ONE app”. And it still takes 2 hours to warm up.
And there we have it. The mid-experiment update. Keep watching for further information.