Do not ignore symptoms that may be due to low or high blood glucose. If you have symptoms that do not match the Sensor glucose reading or suspect that your reading may be inaccurate, check the reading by conducting a finger stick test using a blood glucose meter. If you are experiencing symptoms that are not consistent with your glucose readings, consult your health care professional.

Can I start a 2nd Sensor when I have less than 24 hours left on my old Sensor?

No, the FreeStyle Libre Reader can only be connected to a single Sensor. At the completion of the Sensor-wear, a new Sensor can then be started.1

Reference

1. FreeStyle Libre flash glucose monitoring system User's Manual.