User's Manual

Dexcom G5x System User Guide
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2.6 Calibration Warning and Precautions
Calibration is the process of making sure your sensor continues to be
accurate. Your sensor doesn’t automatically know what your glucose levels
are—you have to teach your system what a given BG value is by entering in a
KNOWN glucose value from your BG meter.
Warning
Calibrate on Schedule
Calibrate at least once every 12 hours. Calibrating less often than every 12
hours might cause sensor glucose readings to be inaccurate, resulting in you
missing a severe low or high glucose event.
Precautions
Be Accurate, Be Quick
Enter the exact BG value displayed on your BG meter within five minutes of a
fingerstick.
Entering the wrong BG values, or waiting more than five minutes before entry,
might affect sensor performance, resulting in you missing a severe low or high
event.
Significant Glucose Rate Changes
Don’t calibrate when your BG is changing at a significant rate: more than 2
mg/dL per minute.
Look for rate of change arrows on your display device screen and don’t
calibrate when you see:
• A single arrow, pointing up
o Rising 2-3 mg/dL each minute
• Two arrows pointing up
o Rising more than 3 mg/dL each minute
• Single arrow pointing down
o Falling 2-3 mg/dL each minute
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