Yes, it is required to keep the FreeStyle Libre 2 app§ running in the background when using the alarms≠ functionality and to receive real-time glucose readings. We have not seen a reduction in mobile phone battery life for users receiving real-time glucose readings.
§The FreeStyle Libre 2 app and the FreeStyle Libre 2 reader have similar but not identical features. Finger pricks are required if glucose readings or alarms do not match symptoms or expectations. The FreeStyle Libre 2 sensor communicates with the FreeStyle Libre 2 reader that started it or the FreeStyle Libre 2 app that started it. The FreeStyle Libre 2 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 Libre 2 requires registration with LibreView.
≠Notifications will only be received when alarms are turned on and the sensor is within 6 meters of the reading device.