Libre readings changing

[Ref]

I've noticed something weird with my libre recently. On a scan it showed my BG as 15.6 and rising slowly. I knew I had insulin on board so decided to wait before doing anything. I scanned again 10 minutes later and it said 10.4 but the graph showed my BG as not getting anywhere near 15.

Has anyone else experienced this?

Thanks
Andy

 

[danielmg]

Hi Andy. This had happened with my libre on a few occasions. It's not something that has happened a lot, but it does seem strange when the initial result doesn't appear on the daily graph. I wonder if when the libre is scanned again quickly afterward, that the 8hrs of previous data is updated, and somehow recognises the former result as being an anomaly? I don't claim to understand how the libre is programmed to work, so just a suggestion.

 

[barrym]

Have a look back to a question I posted a couple of months back where I received a very credible answer in explanation to how this occurs.

Edit. Might have been diabetes.co.uk actually. I'll see if I can find it later.

Edit 2. https://www.diabetes.co.uk/forum/th...tored-data-discrepancies.178419/#post-2344281

HTH

 

[nonethewiser]

Mentioned this before, one puzzling aspect of libre, no answer to give.

Usually when it occurs its on waking, scan get for example 10.2 test bg 7.1, then scan again 20mins after reading be around 7 with no trace of10.2 & flattish line overnight.

Replies to barrym post on red forum make no sense to me given wide difference in own readings, doesn't happen all time but when seeing higher reading on morning always do bg check

 

[barrym]

If it is as suggested a 'smoothing' algorithm, a useful experiment might be to use one of the third party apps with less sophistication and see how that presents.

I suspect that without seeing the Abbott specification we will never know for definite.

 

[Robin]

I always thought it was more to do with the algorithm that tries to catch up a spot reading with real time, to reduce the 15 minute lag between an interstitial fluid and a capillary blood reading. If my blood glucose is rising fast, but it’s about to turn the corner, I often get a higher reading that then disappears from the graph, so I assume the algorithm thought I was still rising, so it added a bit on. When the next timed reading is automatically done, and finds my BG lower, it cancels the estimated reading from the graph.
@everydayupsanddowns knows a lot about the inner workings of the Libre's psyche, he’ll probably know.

 

[Ref]

Thanks for the replies. I'm just glad I'm not the only one to have noticed this - thought I was going mad !

 

[nonethewiser]

Thanks for the replies. I'm just glad I'm not the only one to have noticed this - thought I was going mad !

Thought same mate.

Another oddity, likely my body though, readings on right arm more accurate than on left, left can be much as 1.5 out from bg reading. Not knocking libre as kit is life changing, makes good control more achievable.

 

[barrym]

I have similar experiences. Not a thoroughly tested theory, but I'm convinced that the majority of sensors that Abbott have replaced for me have been on the right arm. I have mentioned it a number of times, but they say it is just coincidence. Hmm.