User's Manual

Dexcom G5x System User Guide
Troubleshooting
339
Device
What you see
Problem
What you do
Smart
Device:
In app
Meter - from blood
Sensor - from
interstitial fluid
20/20 Rule:
If the meter shows 80
or less, CGM should
read within ± 20 points.
If the meter shows 80
or above, the CGM
should read ± 20%.
Example: a 202 mg/dL
sensor reading and a
188 mg/dL glucose
meter value = a 7%
difference (this is still
considered accurate).
Outside of 20/20
rule:
Calibrate again.
Receiver
Device
What you see
Problem
What you do
Smart
Device:
In app
Not getting
sensor glucose
readings.
See Chapter 9.
Wait.
System will often
resolve itself.
Check transmitter—is it
properly inserted into
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