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.

Does the FreeStyle Libre system meet the new ISO standard?

The FreeStyle Libre flash glucose monitoring system is not a blood glucose meter but a Sensor-based monitoring system to measure glucose levels in interstitial fluid. There is no current ISO standard for measuring glucose in interstitial fluid. The on-board blood glucose meter in the FreeStyle Libre reader does meet the ISO 15197 (2013) standard.1

Reference

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