It occurred to me the other day that even though I wrote a couple of blog posts and even made a video about it, I still haven’t addressed one major component of my new Livongo blood sugar meter: its accuracy.
How does it stack up to my Verio meter? More importantly, do I think it’s accurate?
Well…the answer isn’t cut-and-dry because I think it can be accurate…as long as my blood sugar isn’t above 200.
How did I arrive at this conclusion?
I conducted a little experiment.
Bear in mind here, I’m no expert in experimental design, so I established a simple setup for this. During the period of approximately two weeks, whenever I checked my blood sugar, I used the same drop of blood on test strips for two different meters: my Livongo and my Verio.
And the results were interesting, to say the least.
Whenever I was about 80-180, my results from the Livongo meter and the Verio meter were within about 10 points from one another. One instance, I was 86 on the Livongo and 92 on the Verio. Another time, I was 105 on the Verio and 113 on the Livongo. The meters never reported the exact same number at any point during my experiment, but I was happy whenever they showed similar results.
Things got dicey, though, any time I entered the hyperglycemic range.
It was weird and I can’t explain it, but the Livongo would report that I was anywhere from 20-50 points higher than what was on my Verio at a given point in time when my levels were 200+. This really surprised me, because I’d suspected that my Verio skewed a little higher compared to most other meters, so I never thought that the Livongo would prove me wrong about that. At times, it was truly maddening: On one occasion, the Livongo said I was 251 and my Verio said I was 204. That’s the difference of at least 1-2 units of insulin for me in order to correct that high! Even more frustratingly, because I didn’t trust the result from either machine, I checked my blood sugar again immediately and the Verio said 242, while the Livongo said 228.
That particular example was extremely confusing because I didn’t know which piece of technology to trust. And that’s the big thing for me: I need to know that I can depend on whichever blood sugar meter I’m using to deliver accurate results.
So again, remember that I’m no good with numbers, and that this is simply an estimation…but if I had to guess how many times the Livongo agreed with the Verio, I’d say it was no more than 7 out of 10 times. And I’m super bummed about that, because I’d genuinely hoped that I could trust my Livongo meter and use it full-time whenever I was taking a break from my CGM. Given the fact that it seems to be accurate when my blood sugar is in range, though, I suppose I could use that as motivation to work harder to prevent hyperglycemic readings…but I’m not perfect and I know that they will still happen from time to time. And I deserve a piece of technology that will accurately report them to me so I can make the best possible treatment decisions.
In theory, I still like the Livongo: It has a great design and some of its features (e.g., test strip reordering) are totally unique. But in practice? It leaves a bit to be desired.