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 users Add/Edit notes to any scan within 15 minutes or just last scan only?

Users can only add/edit notes associated with the last scan or last blood glucose strip test within 15 minutes.1

Reference

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