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What your alarms¤ mean

Think of alarms as gentle reminders that are always working in the background—so you don’t have to guess what’s happening.

an image of a woman sleeping with a glucose alarm on her phone and a visible sensor on her arm an image of a woman sleeping with a glucose alarm on her phone and a visible sensor on her arm an image of a woman sleeping with a glucose alarm on her phone and a visible sensor on her arm

When does the FreeStyle Libre 2 system or FreeStyle Libre 3 system send alarms?

When your glucose goes above or below the threshold you set, alarms¤ give you a gentle nudge. You may get an alarm on your smartphone◊ at night if your levels drop below your threshold while you’re asleep.

Alarms are optional¤ and can be adjusted to be silenced when you need quiet. It’s support that’s designed to move with you, not overwhelm you.

Low glucose alarms sound◊,¤ when your levels fall below 3.9 mmol/L1,2.

an image of a low glucose alarm notification on the phone an image of a low glucose alarm notification on the phone an image of a low glucose alarm notification on the phone



High glucose alarms appear¤,◊when your levels rise above 13.9 mmol/L1,3

If your levels rise above 22.2 mmol/L or you are out of range, you’ll get a High Glucose Alarm.


an image of a high glucose alarm notification on the phone an image of a high glucose alarm notification on the phone an image of a high glucose alarm notification on the phone

You got an alarm¤,◊. Now what?

When your phone or reader buzzes¤,◊, take a breath. That sound is a cue to look, not panic. Open your LibreLink app or Libre 3 app or Libre 2 reader or Libre 3 reader and glance at two things:

   1- Your current glucose number

   2- The trend arrow showing if your levels are rising or falling

If levels are moving fast, you’ll know it’s time to take action.


Notice patterns in your alarms.

Was your alarm connected to a particular meal or lots of movement? Did you get an alarm the last time this happened, too?

Over time, you’ll start to see not just data, but patterns that make sense, helping you set new health goals that you can meet with the help of the FreeStyle Libre 2 system or FreeStyle Libre 3 system.



an image of a low glucose alarm notification on the phone an image of a low glucose alarm notification on the phone an image of a low glucose alarm notification on the phone

Further reading

Physical activity & wellbeing

⏱ 10 minutes read

Discover how exercise and emotional well-being can support your diabetes management.

Learn more

Share data with caregivers

⏱ 3 minutes read

Share your glucose data with friends, family and caregivers with the LibreLinkUp app.§

Learn more

References & Disclaimers

Images are for illustrative purposes only. Not real patients or data.

¤ Notifications will only be received when alarms are turned on and the sensor is within 6 metres (20 ft) unobstructed of the reading device.

◊ The FreeStyle Libre systems apps are only compatible with certain mobile devices and operating systems. Please check our website for more information about device compatibility before using the app. Use of the FreeStyle Libre systems apps may require registration with LibreView.

§ The LibreLinkUp app is only compatible with certain mobile devices and operating systems. Please check www.librelinkup.com for more information about device compatibility before using the app. Use of LibreLinkUp requires registration with LibreView. The LibreLinkUp mobile app is not intended to be a primary glucose monitor: home users must consult their primary device(s) and consult a healthcare professional before making any medical interpretation and therapy adjustments from the information provided by the app. 

† Finger pricks are required if your glucose alarms and readings do not match symptoms or when you see the Check Blood Glucose symbol during the first twelve hours. 

1. FreeStyle Libre 3 App User Manual and FreeStyle LibreLink App User Manual.

2. Low Glucose Alarm is initially set to 3.9 mmol/L; users can change this value between 3.3 mmol/L and 5.6 mmol/L.

3. High Glucose Alarm is initially set to 13.9 mmol/L; users can change this value this value between 6.7 mmol/L and 22.2 mmol/L.

ADC-2690057 v1.0

 

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