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Different and Accurate

Why are glucose readings different?

Rather than taking glucose readings from your blood, CGM sensor

readings are taken from interstitial fluid, a thin layer of fluid that

surrounds the tissue cells below your skin. As carbohydrates

are digested, glucose enters your bloodstream before they are

absorbed into the interstitial fluid.

Think of glucose readings as the cars of a train where the front

of the train is blood glucose and the back of the train is sensor

glucose.

BG = Blood Glucose

SG = Sensor Glucose

When the train is traveling on a flat track, where there is little

fluctuation between glucose levels, blood glucose and sensor

glucose are similar.

Pg 24 of 28

Meals

160

116

Understanding the lag

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.

Insulin

129

When glucose levels are

changing rapidly, blood

glucose may not be the

same as sensor glucose.

Reference: 1. Tarini, Chetty. "The Technology of Glucose Sensors." In Glucose Sensor Use in Children and Adolescents,

pp. 7-12. Springer, Cham, 2020.

Activity

103

This difference is known

as the lag,

and will be

more evident after meals,

insulin, and activity.

Pg 25 of 28