Sensors can take some time to calibrate themselves and 'settle in' – usually half an hour, sometimes as much as 6 hours.
A new sensor may take a few hours to calibrate itself. If you are still getting unexpectedly high readings after an hour, check back over what you’ve eaten or for any stress or exercise to make sure there is no reason why the line should be high.
If you can’t identify a reason it could be that the sensor is calibrated slightly differently to your previous one. You can still use this sensor to check for the general trends and shape of your line.
We will monitor any concerns with sensors and recommend you remove it and replace with a new one if necessary.
Variability between sensors is common
There is also some built-in variability with glucose sensors – they tend to have a margin of error of +/-10%, according to the sensor manufacturers. This is just the nature of the tech, as of its current stage of development – it's much more 'approximate' than many other technologies we use in our daily life.
So if your last sensor was veering under, and the new one veering over, there could be as much as a 20% difference between the two – and a 'jump' much higher from a low-reading sensor to a new high-reading one. They normalize over time though. With Limbo, the key thing is less the absolute level, but the directionality and movements up and down, so you needn't be worried.