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 the reader be used while charging?

The reader can be used while charging via an electrical outlet, but cannot be used while charging via computer. The ability to perform a blood glucose test via a test strip is disabled when the FreeStyle Libre reader is connected via the USB cable and adapter.1

Reference

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