What do I do if my blood glucose meter is not within the accuracy (20/20) range of my Dexcom G6?
There may be times when your readings temporarily don’t match, but don't panic--they are likely to become closer over time. You may find that this occurs for a few common reasons:
- The first day of a sensor: Newly inserted Dexcom G6 sensors can register glucose readings that are less consistent with those of a blood glucose meter. Those readings should become more aligned over the first 24 hours of sensor use.
- Your glucose level quickly changes: If your glucose level quickly changes, it becomes more difficult to compare the values shown on your Dexcom G6 and a blood glucose meter. This is because these two different pieces of technology measure glucose from different sources (blood versus interstitial fluid), and blood glucose changes a little before interstitial fluid glucose. Once your glucose level stabilizes, though, the values should become closer and easier to compare.
- There is pressure on the sensor: If something is pressing on your Dexcom G6 sensor, it can affect your readings. This discrepancy should be easily resolved once the pressure is relieved.
Watch your Dexcom G6 readings over several hours to help determine the best course of action for you. If your Dexcom G6 readings are always higher (or always lower) than your meter values and always outside the 20 rule, consider calibrating. Also consider calibrating if your Dexcom G6 and meter numbers don’t match and your expectations or symptoms fit the meter value, but not the Dexcom G6 reading.
LBL019054 Rev002
Related articles
Is my Dexcom sensor accurate?
The test your doctor does is considered a more accurate glucose number than any products you use at home. Both BGMs and Dexcom G6 are compared to that doctor’s test to measure accuracy in clinical studies.
Dexcom CGM vs. Blood Glucose Meters: Which Is Accurate?
For Dexcom CGM users, the expected level of accuracy is based on comparisons to the traditional self-monitoring of blood glucose (SMBG).