The Freestyle Libre 2

The Freestyle Libre 2 is replacing the Freestyle Libre and is currently being rolled out across the UK. If you previously used the Freestyle Libre, your prescription should automatically change to the Libre 2 when your GP system is updated, although the timing of this will vary across the UK.

What’s the difference between Libre and Libre 2?

The main difference is that Libre 2 allows you to set alarms warning you about low and high blood glucose readings. You can choose what levels to set the alarms at rather than relying on default pre-set levels.

If I already have Libre, do I need to change anything?

There isn’t any change in how you apply the sensors with Libre 2. If you use your phone to scan your sensor, the app has already been updated to be compatible with Libre 2 so as long as your app is up to date then you shouldn’t need to do anything further.

The original Libre handset will scan Libre 2 sensors, however, you will need to get the Libre 2 handset if you wish to use the high and low blood glucose alarms. To find out more about replacing your original Libre reader with a Libre 2 reader, please go to the Freestyle Libre website.

Note: there is currently a problem with the supply of the standard Libre 2 readers; you should speak to your diabetes team to discuss alternatives. 

How do I set a low or high blood glucose alarm?

Instructions for setting alarms for both phones and readers can be found on the Freestyle Libre website.

Which alarm should I set first?

Setting a low blood glucose alarm first is a good way to get used to using the alarms. Once you are comfortable with this, you could then add a high blood glucose alarm later.

What level should I set the low glucose alarm?

4.5 mmol/L, rather than the default 3.9mmol/L, is a sensible place to start so that you have a warning before you become hypoglycaemic. This choice will vary from person to person and your diabetes team can advise you on what threshold to set your low glucose alarm.

What should I do when I hear the low glucose alarm?

Scan the sensor – the low blood glucose alarm will not tell you what your blood glucose level is. You may also wish to do a finger prick check.

What about the high glucose alarm?

Once you are used to using the low blood glucose alarm, you may wish to discuss setting the high blood glucose alarm with your diabetes team.

The level at which to set the high glucose alarm will vary greatly from person to person and depends on things like your usual level of glucose and what you want to achieve with your diabetes control.