Hi, I have my first Freestyle sensor and its readings via the Freestyle LibreLink do not agree with my SD Codefree. The latter is 6 years old, has a new battery, has been recalibrated using the supplied dummy strip and gives readings that I have always believed in (!) and that have slowly worsened over the years. Moreover, during the 6 week period, approx, over which I have reduced my carbs to sub-30g/day from maybe 200g/day, it has looked convincing in the way that the 'spikes' from groups of vegetables have decreased as I decreased their amounts (e.g. my 3 egg veggie omelette's decreasing 70g mushrooms, 50g red pepper, 50g onion and 50g garden peas to 70/25/25 and 0g peas in stages). Maybe it's always been incorrect?
The Freestyle sensor, fixed to the back of my right arm like in the pictures - its top is half way between shoulder and elbow, tends to show a comparable reading to the Codefree before the above breakfast and shows a similar trajectory curve (reaches its peak at the same time, and returns to normal somewhat quicker, as the Codefree) but the maximum value is much lower, e.g. 8.1 vs 9.1 at breakfast and 7.5 vs 8.4 at lunch. So the peak rise at breakfast according to Codefree is +2.3, but only +1.3 for the Freestyle. A big %age difference.
I take the readings, 2 every 15 minutes, in the order Codefree, Freestyle, Codefree, Freestyle. The Freestyle ones are always the same and very quickly done, and the Codefree ones are almost always within 0.3 of each other; if not within 0.3, repeat.
Looking at each time point's readings, there is no simple multiplier that could be applied to the Freestyle that would make it match the Codefree.
One of the reasons for trying CGM is to find out whether my body is exhibiting aberrant behaviour when I'm not looking. But, of course, if its readings are inaccurate and muted it can still register unusual behaviour as if it were within normal range.
TIA. Any observations welcome!
(T2D, DX 2014, diet-controlled)
The Freestyle sensor, fixed to the back of my right arm like in the pictures - its top is half way between shoulder and elbow, tends to show a comparable reading to the Codefree before the above breakfast and shows a similar trajectory curve (reaches its peak at the same time, and returns to normal somewhat quicker, as the Codefree) but the maximum value is much lower, e.g. 8.1 vs 9.1 at breakfast and 7.5 vs 8.4 at lunch. So the peak rise at breakfast according to Codefree is +2.3, but only +1.3 for the Freestyle. A big %age difference.
I take the readings, 2 every 15 minutes, in the order Codefree, Freestyle, Codefree, Freestyle. The Freestyle ones are always the same and very quickly done, and the Codefree ones are almost always within 0.3 of each other; if not within 0.3, repeat.
Looking at each time point's readings, there is no simple multiplier that could be applied to the Freestyle that would make it match the Codefree.
One of the reasons for trying CGM is to find out whether my body is exhibiting aberrant behaviour when I'm not looking. But, of course, if its readings are inaccurate and muted it can still register unusual behaviour as if it were within normal range.
TIA. Any observations welcome!
(T2D, DX 2014, diet-controlled)
