Sensor Glucose (SG) and Blood Glucose (BG)


Device: Guardian™ Connect system

While BG meters measure glucose in the blood, the Guardian™ Connect CGM system measures the glucose levels in the interstitial fluid between the cells. For this reason meter readings and glucose readings from your sensor will rarely be exactly the same. This difference between BG and SG is okay and should be expected.

You can expect to see a larger difference between your BG meter reading and the sensor glucose reading when your glucose levels are rising or falling quickly.

Examples of times when you might see this larger difference in your BG and SG:

  • After meals or taking insulin
  • During and after exercise
  • When arrows appear on your Guardian™ Connect app screen

Glucose values graph