CGM Basics

What is the difference between a Dexcom CGM sensor glucose value and blood glucose value (BGV)?

Last Updated · September 28, 2021

Dexcom CGM systems measure the glucose levels in the interstitial fluids just beneath your skin. Blood glucose meters measure glucose levels in your blood.

Different body fluids give different numbers, so there may times when your readings temporarily don’t match.

However, if your sensor readings do not match your symptoms:

  1. Wash your hands with soap and water
  2. Dry them
  3. Take a fingerstick with your meter

If your meter value matches your symptoms, use it to make treatment decisions.

5-step learning journey

Discover education resources, organised in a 5-step journey, to learn key information about your Dexcom ONE CGM system, from getting started, your first 10 days, to using Dexcom ONE in the long run.

Step 1: The basics of CGM
Step 2: Getting started
Step 3: Your first 10 days
Step 4: Using Dexcom ONE in the long run
Step 5: Understand your Diabetes trends