If for any reason the Sensor does not work, an error message will appear on the FreeStyle LibreLink app prompting users to replace the Sensor. Users should not ignore symptoms that may be due to low or high blood sugar. If users have symptoms that do not match the FreeStyle Libre 2 system reading, or if users suspect that their reading may be inaccurate, check the reading by conducting a finger prick test using a blood sugar meter. If users are experiencing symptoms that are not consistent with sugar readings, users should consult their healthcare professional.