Dexcom, one of the world’s leading diabetes management companies, recently released its updated version of the Dexcom G7 Continuous Glucose Monitoring (CGM) System in 2025. The technology was created to make diabetes more manageable for the millions of individuals around the world who live with the disease.
Dexcom CGM has been around since 2006, and its generations have only advanced since the technology's arrival. The company’s latest device, Dexcom G7, has two variations. A 10-day version came out in 2023, and two years later, the U.S. Food and Drug Administration cleared a 15-day version.
Dexcom
How Dexcom G7 works
Both Dexcom G7 and Dexcom G7 15 Day have a sensor and transmitter included in one device, allowing users to track glucose levels and other alerts on their phones, smart watches and integrated insulin pumps. The device is typically placed on the back of the arm, and is 60 percent smaller – about 0.94 inches in length and 1.07 in width – than the G6 device.
Dexcom G7 15 Day is for adults 18 and over with both Type 1 and 2 diabetes, providing user-friendly alerts, such as urgent low glucose messages and quiet mode silencing notifications. Designed for efficiency, the device does not require a finger stick, and only needs changed two times a month.
As CGM technology has evolved, the Mean Absolute Relative Difference (MARD) accuracy ratings have decreased, making the percentage difference between the laboratory reference values and sensor readings closer to one another. This rings true as Dexcom G7 15 Day has an 8 percent MARD in comparison to the 9 percent MARD of the G6.
Additionally, both Dexcom G7 and Dexcom G7 15 Day now have a Smart Food Logging feature backed by AI, allowing people using G7 to take pictures of their meals in the Dexcom G7 app. Users receive insights on nutrients, metabolic impacts and other meal descriptions to learn how their food benefits their body. Dexcom plans to continue incorporating AI into its app to make its upcoming generations more personalized for users.
The 10-day version has what Dexcom calls a 30-minute warm-up time, giving the sensor time to read and become accustomed to a user’s body signals and glucose levels. The 15-day version has a 60-minute warm up time, which is longer to accommodate the device’s longer wear time.
Both Dexcom G7 and Dexcom G7 15 Day also have a 12-hour grace period for sensor changes, allowing users to track their glucose levels with higher efficiency.
Dexcom
Trial and error
Though Dexcom G7 comes with many advanced features, Dexcom is actively working out errors users have reported while using the device.
Because of the 10-day and 15-day wear times, many users have reported the adhesive peeling off, sensor failures and signal loss. Several users have also recorded inaccurate readings within the first 24 hours of installing the device.
These technical issues have not been a problem for all G7 users. However, Dexcom is urging users who face issues to troubleshoot their devices by ensuring Bluetooth connectivity or reaching out to Dexcom Technical Support for replacement devices.
Plans for growth
By incorporating customer feedback, Dexcom is working to address reported problems within the G7, so upgrades such as longer wear times remain an option for users.
Looking to future generations, Dexcom intends to decrease the size of the eventual G8 device by 50 percent, improve the MARD accuracy and eventually phase out the G6 device.
The G8 device is in developmental stages, but Dexcom hopes to release the new device within the next two years.
Sandhya Kannan is an editorial assistant at CityScene Media Group. Feedback welcome at feedback@cityscenemediagroup.com.
