Abbott FreeStyle Libre 2 Get Started page 28

The CGM Diff erence
It's expected that sensor glucose and blood glucose
readings won't always match.
CGM readings can be diff erent than Blood Glucose Monitor
(BGM) readings but are proven to be accurate.
can be used for treatment decisions. *
CGM measures interstitial fl uid glucose,
Blood glucose
readings are taken
from blood with
fi ngersticks.
There are additional times when CGM and
may be diff 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)
*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.
Pg 28 of 32
CGM Sensor
Glucose enters your bloodstream fi rst
before it enters the interstitial fl uid.
1
not blood glucose.
Skin Layer
CGM readings
1
CGM readings are
taken from interstitial
fl uid, a thin layer of
fl uid that surrounds
the cells below your
skin.
BGM readings