Abbott FreeStyle Libre 2 - Page 27

SG
SG
BG
BG
103
129
92
93
Insulin
Activity
Pg 27 of 32
Understanding the lag
1
Because glucose enters the bloodstream first, blood glucose
readings lead sensor glucose readings. Eventually, sensor glucose
readings catch up to blood glucose readings just like the back of
a train following the front of a train.
Instead of focusing only on a single moment in time, CGM gives
you a more complete picture of where your glucose is going, and
where your glucose has been, so you can make more informed
treatment decisions.
When glucose levels are
changing rapidly, blood
glucose may not be the
same as sensor glucose.
This dierence is known
as the lag,
1
and will be
more evident after meals,
insulin, and activity.
Reference: 1. Tarini, Chetty. "The Technology of Glucose Sensors." In Glucose Sensor Use in Children and Adolescents, pp. 7-12.
Springer, Cham, 2020.