Medtronic guardian Getting Started Manual - page 4
Understanding CGM | 2
Skin
Glucose Sensor
Interstitial Fluid
Cell
Glucose
Blood Vessel
MiniLink
®
Understanding CGM
1
GlUCose re AdinGs
Your BG meter measures glucose (sugar) levels in your blood, and your glucose sensor measures
glucose levels in the fluid surrounding the cells in your tissue, which is called interstitial fluid.
Most of the time, glucose travels first to your
blood and then to your interstitial fluid.
Because of how glucose travels, your BG
meter readings and sensor readings will
rarely match exactly. This is normal and
should be expected.
Usually your BG meter readings and your
sensor readings will be very close.
However, when glucose levels are rising or falling quickly, you should expect to see a larger
difference between your BG meter value and the sensor glucose reading. Examples of times
when this may occur include:
• After meals or insulin
• When or arrows appear on your Guardian® Monitor
Use CGM to understand your glucose trends.
Focus on what matters: the
direction
and the
speed
of sensor glucose
change. Pay less attention to each individual glucose number.
Always rely on BG meter readings for therapy adjustments.