FDA Clears Dexcom G7 15 Day

People with diabetes in the U.S. will soon have access to Dexcom’s newest continuous glucose monitor (CGM). On April 10, 2025, Dexcom announced the U.S. Food and Drug Administration (FDA) has cleared its Dexcom G7 15 Day CGM system for adults 18 and older.

Dexcom reports that its new 15 Day CGM sensor enhances the capabilities of the previous Dexcom G7 10 Day CGM. This system has been clinically demonstrated to improve A1C, minimize instances of hyper– and hypoglycemia, and extend time in range.

Accurate CGM glucose data is critical, particularly when paired with an automated insulin delivery (AID) system, for making informed decisions. This level of precision becomes even more essential with the extended wear time of Dexcom’s latest innovation, which brings both promise and challenges into focus.

Dexcom’s longest-wear sensor attempt yet: 15.5 days 

The new Dexcom G7 is designed for up to 15.5 days of wear (including a 12-hour grace period), making it the company’s longest-lasting sensor to date. This extended wear time means fewer monthly sensor changes, reducing both interruptions and medical waste. 

Taylor Rindfleisch, a Dexcom G7 user, highlighted the impact.

“Living with diabetes generates a lot of waste, and this is an exciting step toward reducing that.”

For Britt Prim, a shorter calibration time compared to her G6 is a massive selling point.

“The two-hour calibration I have now is so hard, and I am always surprised by where my glucose goes in a 2-hour window.”

Prim also noted that fewer site changes allow old sites more time to heal.

High accuracy for better decision-making

The Dexcom G7 15 Day sensor is designed to provide users with highly accurate glucose readings.

MARD (mean absolute relative difference) evaluates the accuracy of glucose sensors and has been used for over 20 years, despite its limitations. Lower MARD values indicate more accurate readings closer to real glucose levels.

The Dexcom G7 15 Day sensor has a MARD of 8.0%, meaning the sensor’s readings are typically within 8% of lab results. 

MARD scores of other CGMs include:

• Freestyle Libre 3 – 7.8%
• Dexcom G7 – 8.2%
• Senseonics Eversense – 8.5%
• Medtronic Guardian Connect – 8.7%​
• Freestyle Libre 14 day – 9.4 %

MARD can vary with sensor age, individual physiology and clinical settings. These variations highlight the critical need for accurate glucose monitoring, as accuracy builds confidence in glucose data, helping users make informed decisions throughout the day. 

Mariana Gomez, another Dexcom G7 user, stressed how improved accuracy fosters trust in the data and supports smarter, faster decision-making.

Justin Eastzer, representing Diabetech, shared similar sentiments, emphasizing the importance of consistent performance for maintaining accuracy during the sensor’s longer wear period.

Popular features with added convenience 

The G7 15 Day includes features users already enjoy, such as a waterproof design and the option to connect directly to an Apple Watch. It also lets users log meals, activity and medications in the app. 

Like the current G7, a 12-hour grace period provides flexibility to switch to a new sensor after the current session ends.

Gomez expressed interest in learning more about the automated activity logging feature.

Reliability concerns surrounding extended wear time

Eastzer highlighted the critical need for reliable sensors that maintain both data accuracy and functionality over extended wear times.

Eastzer’s concerns were reflected in Dexcom’s study, which showed that 73.9% of sensors lasted the full 15 days. However, 26% failed prematurely despite proper use, underscoring the reliability challenges he raised.

Availability and future integration with AID systems 

Dexcom plans to launch the 15-day version in the second half of 2025. The company is also working to ensure compatibility with AID systems to expand its functionality.

While most other features remain similar to the current G7, the extended wear time has garnered attention as a significant advancement.

Stay updated on the Dexcom G7 15 Day 

For more information on the Dexcom G7 15 Day or updates on its U.S. availability, visit dexcom.com/15day.