I find the freestyle to be inaccurate in two ways. The first is that it doesn’t determine my glucose levels in any way that can be trusted. Yes I know it is interstitial glucose, not blood glucose. Abbot claims they have proprietary algorithms that can translate between the two. The second is that the difference between my ten finger sticks a day and the raw data from the sensor is inconsistent and not proportional. The variance is really, well, variable. Again I know the difference between interstitial glucose and blood glucose. In my body, after months of paying attention, I have found a change in blood glucose is reflected in my interstitial glucose after fifteen minutes. That means the changes in glucose between ginger sticks and the freestyle sensor should approximate eachother. Sometimes yes, sometimes no. Overlay the graphs of the two, they should have about the same shape. Not always.
I do however get value from using glimp. It tries to calibrate the raw data from the sensor to my finger sticks and after twenty or so sticks over two days, it is pretty close. I have learned which foods cause sharp spikes and which cause gentle rises. I can see my Dawn Phenomenon clearly. It also gets me to stick my finger more often.
The freestyle Libre sensor and reader however are far from accurate enough, by themselves, to eliminate fine sticks. I have had a wide range of experience with the sensors. Some are rather stable, others are all over the board. I do put them in basically the same spot to reduce the placement variable.
Is not where it should be, reliability or accuracy wise to be sure, but it’s better, in my opinion, than fiber sticks alone.