Your current FreeStyle Libre reader will not work with the new FreeStyle Libre 2 sensor.

Use the FreeStyle LibreLink app available on the Apple App Store or Google Play Store to scan your FreeStyle Libre 2 sensor.

The FreeStyle Libre 2 readers will be available in South Africa towards the end of 2024.

Discovery Health Medical Scheme members should continue claiming FreeStyle Libre 2 sensors via CDE, M-KEM, Pharmacy Direct, and Medipost to avoid co-payments (depending on plan type).

If you claim from a pharmacy not listed above, the price of each sensor may be greater than the approved CGM benefit amount, and the amount billed by pharmacy would be for your own account.

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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 faster alarms4

5x more readings power 5x faster alarms4 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 and off and easy-to-adjust sound and vibration.5

Accuracy at every level6

You can rely on proven alarm accuracy, especially in the low glucose range.6

How it works

  • Activate

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


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

If you use Do Not Distrub mode on your phone:

Turn off Do Not Disturb mode or manage the settings for your alarms to override Do Not Disturb

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 in your alarm settings.¤

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 sensor.

◊ 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. Use of FreeStyle LibreLink may require 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.

§ The LibreLinkUp app is only compatible with certain mobile devices and operating systems. Please check 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. For full instructions please refer to your FreeStyle Libre App* User manual.

2. 3.9 mmol/L is the default Low Glucose Alarm level and can be set between 3.3-5.6 mmol/L.

3. The default High Glucose Alarm level is 13.3 mmol/L on the FreeStyle LibreLink app and 13.9 mmol/L.

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

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

6. Alva, S. J Diabetes Sci Technol (2020):