The Urgent Low Glucose Alarm level is fixed and cannot be adjusted*†‡, but when Silent Mode§ is turned on, the alarm is delivered without sound for up to six hours at a time following your smartphone's settings.
* The FreeStyle Libre 2 app also has a mandatory Urgent Low Glucose Alarm that lets users know when their glucose value is below 55 mg/dL.
† To get the Urgent Low Glucose Alarm on your phone with the FreeStyle Libre 2 app, you will first need to start your Freestyle Libre 2 sensor with your phone. If you do not start your FreeStyle Libre 2 sensor with your phone, you will not get the Urgent Low Glucose Alarm on your phone.
‡ Notifications will only be received when alarms are turned on and the sensor is within 20 feet unobstructed of the reading device. You must enable the appropriate settings on your smartphone to receive alarms and alerts, see the FreeStyle Libre 2 User’s Manual for more information.
§ Silent mode allows users to silence their signal loss and glucose alarms, including urgent low glucose alarms for up to six hours. You will not hear your glucose and signal loss alarms even if you've turned on Override Do Not Disturb but may still get the visual and vibratory notifications based on your phone's settings.