Abbott FreeStyle Libre 2, Get Started, Page: 8 / 9

Get Started 15 14 Get Started
Different and Accurate
CGM readings are taken
from interstitial fluid, a
thin layer of fluid that
surrounds the cells below
your skin.
Blood glucose readings
are taken from blood
with fingersticks.
FPO
The CGM Difference
There are times when your CGM and BGM readings may be different.
CGM measures interstitial fluid glucose not blood glucose.
CGM systems give you a look at where you were, where you are, and where you’re headed.
You can trust your sensor glucose numbers and can feel confident in your results to
make treatment decisions. The FreeStyle Libre 2 system is approved for insulin dosing
without fingersticks.*
CGM is different from blood glucose monitors (BGM) and proven to be accurate1,
with fewer fingersticks.*
These include when:
• Your glucose is changing rapidly; scan
shows a trend arrow (see diagram, page 11)
• Your fingers were not washed before you
performed a fingerstick test
• You took more than 500 mg of vitamin C
(ascorbic acid)
• Blood glucose strips were expired
or contaminated
• The fingerstick check and sensor scan
were not performed at the same time
• It is the first day wearing your sensor
• The sensor was bumped and is not firmly
attached to the back of your upper arm
Glucose Falling Quickly Glucose Rising Quickly Glucose Is Stable
BGM
CGM
BGM CGM
CGM
BGM
*Fingersticks are required if your glucose alarms and readings do not match symptoms or when you see Check Blood Glucose symbol during the first 12 hours. *Fingersticks are required for treatment decisions when you see Check Blood Glucose symbol, when symptoms do not match system readings, when you suspect
readings may be inaccurate, or when you experience symptoms that may be due to high or low blood glucose.
Reference : 1 . FreeStyle Libre 2 User’s Manual.
Difference Between CGM and BGM Readings
CGM and BGM
readings are often
similar when stable.
Rapidly changing levels, like after a meal or exercise, can
cause a lag between your
CGM and BGM readings.
For most people, the lag
is about 5–10 minutes.
That’s normal.
Glucose enters your blood stream first
before it enters the interstitial fluid.
Skin Layer
CGM Sensor