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Optional Glucose Alarms

Optional glucose alarms available for the FreeStyle Libre apps* let you know the minute your glucose is too low or too high.¤

5x more readings

5x more readings power up to 5x faster alarms1 that let you know the minute your glucose is too high or too low.¤

Easy to set up and use

Optional glucose alarms are easy to turn on, easy to customise low and high glucose alarm ranges and easy to adjust sound and vibration.2

Accuracy at every level

You can rely on proven alarm accuracy at every glucose level.3

How it works

  • Activate

    Choose to set a low glucose alarm, high glucose alarm or both. 
    Signal Loss alarm is automatically turned on when the first time glucose alarm is turned on.

  • Alarm

    Automatically receive an alarm the minute your glucose is too low or too high, even overnight.¤

  • Act

    Use your glucose reading, trend arrow, and glucose graph to take appropriate action right away.

A boy sleeping in his bed with her sensor visible on his arm.

How to set glucose alarms on your smartphone

Once you've started your sensor, follow the instructions below to receive alarms on the FreeStyle LibreLink◊ or FreeStyle Libre 3 app.◊◊

 

How to set glucose alarms on the LibreLinkUp app§

With the LibreLinkUp app, family members and friends can receive your real-time glucose readings and customise glucose alarms.^ For more information about connecting and sharing glucose information with caregivers, go to the LibreLinkUp page. To set up alarms on LibreLinkUp, follow the instructions below.

How to activate alarm notifications on a smartphone

To receive optional glucose alarms on your smartphone, you need to make sure you have notifications enabled for the app. If you didn't enable all notifications and permissions during app set up, how you do it now depends on whether which app you're using and your phone's operating system.

On an iPhone

  • Open Settings

  • Go to Notifications and select the FreeStyle LibreLink app

  • Enable Allow Notifications

  • Tap to check the Lock Screen, Notifications Centre, 
    and Banners options to enable all notifications

If you use Do Not Disturb mode on your phone:

Turn off Do Not Disturb mode or select to turn on Override Do Not Disturb in your alarm settings. Do this if you want the alarm to always play a sound and appear on the lock screen even if your phone is muted or Do Not Disturb is on.

Note: You must accept the app's permission request for Critical Alerts to use this feature. You can also enable the Critical Alerts setting directly from the app's notification settings.

On an Android device

  • Open Settings

  • Go to Apps, select the FreeStyle LibreLink app and select Notifications

  • Tap Notifications and enable All LibreLink Notifications

  • Tap Location and enable Allow only while using the app

  • If you selected Deny for Stop optimising battery usage during app set up, toggle Battery to allow

Note: Override Do Not Disturb functionality depends on the phone model and Android operating system version you are using.

Here's how to make sure you don't miss your alarms

There are some things you can do to make sure you don't miss any glucose alerts:

 

Keep the smartphone's Bluetooth on

Make sure your phone is within 6 meters of you at all times, unobstructed

Do not force close the FreeStyle LibreLink app - let it run in the background

Have Override Do Not Disturb enabled in your alarm settings¤
 

On an iPhone

  • In the phone settings, ensure Bluetooth is ON

  • In the phone settings for the FreeStyle Libre 3 App, allow the app to
    access Bluetooth

  • In the phone settings for the FreeStyle Libre 3 App under Notifications:

    • Keep Allow Critical Alerts ON

    • Keep Allow Notifications ON

    • Keep Lock Screen and Banner alerts ON

    • Keep sounds ON

If you adjust the phone Media volume to silent or use the phone's Do Not Disturb setting:

Turn Override Do Not Disturb setting in the app ON for Low Glucose, High Glucose, and Signal Loss Alarms to ensure you receive audible alarms.

Note: You must accept the App’s permission request for Critical Alerts to use the Override Do Not Disturb feature. You can also enable the Critical Alerts setting directly from the App's notification settings.

On an Android device

  • In the phone settings:

    • Keep Bluetooth ON

    • Keep phone Media volume ON

    • Keep Battery Saver mode OFF

  • In the phone settings for the FreeStyle Libre 3 App:

    • Keep Show Notifications ON

    • Keep Do Not Disturb access permission ON

    • Keep Battery Optimisation OFF

    • Keep Nearby Devices permission ON (for Android 12 or above)

    • Keep Alarms and Reminders permission ON (for Android 12 or above)

  • Do NOT modify channel notification settings for the FreeStyle Libre 3 App:

    • Keep Lock Screen notifications ON

    • Keep Pop-up notifications ON

  • You may need to add the FreeStyle Libre 3 app to the list of apps that will not be restricted or put to sleep.

  • Turn Do Not Disturb Access Permission ON

If you adjust the phone Media volume to silent or use the phone's Do Not Disturb setting:

Turn ‘Override Do Not Disturb’ setting in the App ON for Low Glucose, High Glucose, and Signal Loss Alarms to ensure you receive audible alarms.

Note: You must accept the app’s permission request for Do Not Disturb access to use the Override Do Not Disturb feature. You can also enable the Do Not Disturb access setting directly from the app's notification settings.

Here's how to make sure you don't miss your alarms

There are some things you can do to make sure you don't miss any glucose alerts:

 

Make sure your phone is within 33 ft of you at all times, unobstructed




 

Do not force close the app — it must be running in the background to receive alarms

If you restart your phone, open your app to make sure it’s working properly.

The app will ask for phone permissions that are needed to receive alarms

Allow these permissions when requested or follow the instructions in the enabling notifications section of this page.


Make sure your phone's settings are configured correctly

See the enabling notifications sections above for the correct configuration for your device.

What to do if you receive a signal loss alarm

To continue receiving low or high glucose alarms, check the following steps:

  • Ensure that your smartphone◊ is within range at all times, unobstructed.

  • Do not force close the app – keep it running in the background.

  • Turn off Do Not Disturb mode or select Override Do Not Disturb in your alarm settings.

  • You must accept the app’s permission request for Critical Alerts to turn off Do Not Disturb mode. Or enable the Critical Alerts setting directly from the app’s notification settings.

  • Keep your Bluetooth switched on.

    If you are still receiving the Signal Loss Alarm, visit our Troubleshooting page.

Troubleshoot signal loss alarm

References & Disclaimers

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

* FreeStyle Libre apps refers to the the FreeStyle Librelink app which works with the FreeStyle Libre 2 and FreeStyle Libe 2 Plus sensors or the FreeStyle Libre 3 app which works with the FreeStyle Libre 3 sensor only.

◊ The FreeStyle LibreLink app is only compatible with certain mobile devices and operating systems. Please check the website for more information about device compatibility before using the app. Sharing of glucose data requires registration with LibreView.

◊◊ The FreeStyle Libre 3 app is only compatible with certain mobile devices and operating systems. Please check our website for more information about device compatibility before using the app. Sharing of glucose data requires registration with LibreView.

¤ For FreeStyle LibreLink users, notifications will only be received when alarms are turned on and the sensor is within 20ft unobstructed of the reading device. You must have override do not disturb settings enabled to receive alarms and alerts on your smartphone. For FreeStyle Libre 3 app users, notifications will only be received when alarms are turned on and the sensor is within 33ft unobstructed of the reading device.

§ 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. 

^ Sharing glucose data requires registration with LibreView. The user’s device must have internet connectivity for glucose data to automatically upload to LibreView and to transfer to connected LibreLinkUp app users.

1. Dexcom G6 CGM User Guide and Medtronic Guardian Connect System User Guide.

2. Data on file, Abbott Diabetes Care, Inc.

3. Please see the FreeStyle Libre LibreLink User Manual for complete instructions.

4. 3.9 mmol/L is the default Low Glucose Alarm level and can be set between 3.3-5.6 mmol/L.

5. 13.3 mmol/L is the default High Glucose Alarm level and can be set between 6.7-22.2 mmol/L.

 

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