Dexcom G5 User Manual page 245

Precaution
Use expired sensors. Before inserting, always check the package
Don't:
label for the expiration date using the YYYY-MM-DD format.
Why; If past the expiration date, the sensor glucose readings might not be
accurate.
Consequences: Missing severe low or high glucose event.
Precaution
Share your transmitter with another person.
Don't:
Why: The system is a prescription-only medical device and is meant, or
indicated, for your use only.
Consequences: Your transmitter is tied to
someone else, your reports, Alarm and Alerts, etc., would be wrong,
resulting in you missing a severe low or high glucose event.
Dexcom G5 Mobile System User Guide
How to Take Care of Your Dexcom G5 Mobile CGM System
your
readings. If used by
245