User's Manual

Dexcom G5x System User Guide
Calibration
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Precaution
Do:
Enter the exact BG value displayed on your BG meter within five
minutes of a fingerstick.
Why: Entering the wrong BG values, or waiting more than five minutes
before entry, might affect sensor performance.
Consequences: You may miss a severe low or high glucose event.
Precaution
Do:
Only use fingerstick measurements from your BG meter for
calibration.
Don’t: Use alternative site BG values from your arms, palm of your hand,
etc.
Why: Alternative site BG values may be different and less accurate than
your fingerstick BG values.
Consequences: You may miss a severe low or high glucose event.
7.3 Calibration Overview
What Is a Calibration?
As you learned earlier, the sensor glucose readings come from measuring the
glucose fluids found between your cells (interstitial fluids). Although blood and
interstitial fluids are similar, sensor glucose readings can be different between
your fingerstick and your CGM. Calibration provides a comparison, or
measurement, between your meter’s fingerstick measurement and the
sensor’s glucose readings, allowing alignment between the sensor and meter.
Your BG meter “teaches” the sensor your glucose values through calibration.
Just like a clock can need adjusting—calibrations allow your CGM to adjust to
your body.
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