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The CGM Di erence
CGM readings can be di erent than Blood Glucose Monitor
(BGM) readings but are proven to be accurate.
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CGM readings
can be used for treatment decisions.
*
*Fingersticks are required if your glucose alarms and readings do not match symptoms or when you see Check Blood Glucose symbol
during the fi rst 12 hours.
Reference: 1. FreeStyle Libre 2 User’s Manual.
CGM readings are
taken from interstitial
fl uid, a thin layer of
fl uid that surrounds
the cells below your
skin.
Blood glucose
readings are taken
from blood with
fi ngersticks.
Glucose enters your bloodstream fi rst
before it enters the interstitial fl u i d .
Skin Layer
CGM Sensor
CGM measures interstitial fl uid glucose, not blood glucose.
There are additional times when CGM and BGM readings
may be di erent, including when:
• you took more than 500 mg per day of vitamin C (ascorbic acid)
• you are in the fi rst 12 hours wearing a new sensor
• your sensor is not securely applied
• your sensor kit was stored somewhere outside of temperature
range (36°F to 82°F)
It's expected that sensor glucose and blood glucose
readings won't always match.
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