It’s static (blood glucose testing) sampling versus dynamic (continuous glucose monitoring via interstitial fluid) sampling. The best comparison is that it is l

It’s static (blood glucose testing) sampling versus dynamic (continuous glucose monitoring via interstitial fluid) sampling. The best comparison is that it is like a picture (static sampling) versus a movie (dynamic sampling). It makes a huge difference: you can actually prevent blood glucose fluctuations, blood glucose lows/highs, with a continuous glucose monitor. With a blood glucose meter, at least with type 1 diabetes, you really only can take action after the blood glucose (static sample) is taken, and you really cannot use informed insight moment to moment to prevent things. The continuous glucose monitors tend to be pretty accurate. The Mean Absolute Relative Difference (MARD) for the ascribed devices: Freestyle Libre 3: 9.2% (in adults) Freestyle Libre 2: 9.2% (in adults) Dexcom G6: 9.0% (in adults) Also, I regularly test my blood glucose using finger sticks whenever I need to take a fairly large insulin dose and there is a large amount uncertainty of where I may possibly be (such as when my two sensors have a big discrepancy, and especially when my blood glucose is fluctuating). For that, I use Freestyle Lite blood glucose test strips. About 1 in 25 to 1 in 30 Freestyle Lite test strips I use is about 50 mg/dL off, despite me using proper testing technique, which is quite significant, since my blood glucose values are very tightly managed. It is obvious when it happens, looking at the Freestyle Libre 3 graph, and the Freestyle Libre 3 in this case keeps me from overdosing and causing a serious low.