Thread by @Tims_Pants

#SixOfTheBest CGMs on the same grid.

Data from an n=1 experiment.

Caveat 1: earlier grid had an error, giving readings incorrect dispersion.

Caveat 2: Libre2 data from an earlier experiment due to device failing early in this test and replacement taking 10 days.

Thread.

/1

Calibration was done according to manufacturer directions:

Dexcom ONE & G6 - never;
Aidex - when I felt it was needed;
Glucomen Day - every 24 hours;
Medtrum Nano - Factory calibration was enabled, but calibration was done when it appeared to drift too much;
Libre2 - never.

/2

Dexcom ONE and Dexcom G6 have almost identical dispersion, as you might expect given the sensor and calibration technology is identical:

/3

GlucoRX Aidex has a wider dispersion than either of the Dexcom devices:

/4

This is the Glucomen Day:

/5

This is the Medtrum Nano:

/6

And finally, this is the Libre2, although using a different set of reference data:

/7

What's clear when looking at these results side-by-side is that the dispersion of points in relation to the reference data is much wider for the @GlucoRX Aidex, @GlucoMen Day and @medtrumdiabetes Nano than for #Libre2 or either Dexcom device.

/8

What's perhaps more concerning is that at "out of range" glucose levels (<80mg/dl or >180mg/dl), there appears to be far more inaccuracy in the three newcomers.

The question is, if you were about to drive, which of these sensors is reliably safe?

/9

And secondly, which could you safely use in an Open Source #WeAreNotWaiting automated insulin delivery device?

I wouldn't be comfortable with some of these.

/10

Further data to come over at diabettech.com, but that's the heads up, quick and dirty review.

If you're offered any of these on the NHS, which would you prefer?

#SixOfTheBest

/end

Now published at Diabettech as well, with "MARDf" (MARD Vs fingerpricks) included.

diabettech.com/cgm/six-of-the…