Dexcom G7

Dexcom G7 Sensor and Phone App

For individuals managing diabetes, staying abreast of the latest advancements in continuous glucose monitoring (CGM) is crucial. Dexcom, a leading company in diabetes care, has been developing CGMs for over two decades. Their first CGM, the SEVEN® system, received FDA approval in 2007. Since then, Dexcom has introduced several advanced CGM systems, including the Dexcom G6 and the latest Dexcom G7. This comparison will help you weigh the pros and cons of these two groundbreaking devices.

Current CGM Offerings

Dexcom currently offers the Dexcom G6 and Dexcom G7 CGM systems:

  • Dexcom G6: The sensor measures approximately 1.2 inches (3.05 cm) in width and 1.8 inches (4.57 cm) in length. It is water-resistant up to 2.4 meters for up to 24 hours and is approved for individuals aged 2 years and older.
  • Dexcom G7: This sensor is 60% smaller than the G6, measuring about 1.07 inches (2.72 cm) in width and 0.94 inches (2.39 cm) in length. It is also water-resistant, up to 2.4 meters for up to 24 hours, and is approved for individuals aged 2 years and older.

Advancements in Dexcom G7: A Closer Look

Released in early 2023, the Dexcom G7 offers several improvements over the G6 model. Let’s delve into the key features that set the G7 apart:

  • Size and Placement: The G7 patch is half the size of the G6, offering more flexibility in placement. You can comfortably wear it on the back of the arm or the abdomen. An additional option for children aged two and above is to place it on their upper buttocks. The G7’s transmitter continues to transmit effectively over a distance of 20 feet and even underwater.
  • Sensor Lifespan and Warm-up Time: While the G7 sensor has a lifespan of 10 days, it introduces a 12-hour grace period, allowing users some flexibility. Notably, the new G7 sensor significantly reduces the warm-up time from 2 hours to 30 minutes, enhancing coverage and efficiency.
  • Improved Alarms: The G7 alarms have undergone enhancements, allowing users to delay the first alert for a high reading. Users can personalize alarms to silence or vibration.
  • App Connectivity: The G7 streamlines connectivity by requiring only one app to connect up to 10 people and healthcare providers. The app offers comprehensive insights into sugar trends for various periods, ranging from 3 to 24 hours.
  • Insulin Pump Connectivity: One limitation of the G7, as of September 2023, is its inability to connect to insulin pumps. The Tandem t:slim connects now, and users of the Omnipod 5 will have compatibility soon.

Application and Usage

  • Dexcom G6: The sensor is applied using an auto-applicator and has a 2-hour warm-up period before it begins providing readings. Each sensor lasts for up to 10 days.
  • Dexcom G7: The G7 features an all-in-one design with a 30-minute warm-up time, the fastest of any CGM on the market. It also has a 12-hour grace period to replace finished sensors, allowing for a more seamless transition between sessions.

Performance Comparison: Dexcom G6 vs. G7

Dexcom G6:

  • MARD%: The G6 boasts an average MARD% of 9%, showing strong performance.

  • Connectivity: The G6 can connect to two insulin pumps, Omnipod and Tandem, facilitating automated insulin delivery. However, data sharing with loved ones and healthcare providers requires two separate apps.

Dexcom G7:

  • MARD% Improvement: The G7 showcases enhanced accuracy with a lower MARD% of 8.2% for adults. Data is updated every 5 minutes. Certain substances, such as high doses of vitamin C, may affect accuracy.

  • Streamlined Connectivity: The G7 simplifies connectivity for both loved ones and healthcare providers using a single app. It extends the storage of blood glucose level data when out of reach to 24 hours, compared to the G6’s 3-hour limit.

Price & Monthly Cost Analysis

Dexcom G6:

  • Yearly Cost: Approximately $4800, with a monthly cost of around $400.

  • Components: The transmitter costs about $300 and lasts three months. A pack of 3 sensors, lasting 30 days, costs about $300, plus the transmitter cost every 3 months.

Dexcom G7:

  • Yearly Cost: Approximately $4000.

  • All-in-One Device: The G7 combines the transmitter and sensor into a single device used for 10 days. A pack of 3 devices costs approximately $340.

Usability & Comfort: Dexcom G6 vs. G7

Dexcom G6:

  • Design: The G6 is a small white and lilac-colored device commonly worn on the abdomen. Some users report itching and redness, requiring replacement. The setup is straightforward, with a 2-hour warm-up.

Dexcom G7:

  • Design: The G7, more petite and rounder, is an all-in-one device that is appreciated for its ease of application. It can be worn on the arm, offering an alternative to the abdomen. Its reduced warm-up time to 30 minutes and a 12-hour grace period are notable advantages.

Medicare and Insurance Coverage

Medicare and insurance coverage for CGMs like the Dexcom G6 and G7 typically require:

  • Diagnosis of diabetes

  • Frequent blood glucose testing

  • Insulin therapy with multiple daily injections or an insulin pump

Specific coverage criteria can vary, so it’s important to consult with your healthcare provider and insurance company for detailed information.

Popularity & User Feedback

Dexcom G6:

  • Positive Reception: G6 garnered positive feedback. Users acknowledged a learning curve but highlighted its transformative impact on managing Type 1 Diabetes (T1D). Despite calibration and occasional sensor issues, they considered it a game-changer.

Dexcom G7:

  • Mixed Reception: G7’s reception varies, with users praising its small size but noting concerns about its tendency to fall off. Some users reported frequent disconnections, particularly during activities like exercise. The accuracy is appreciated, with reports of occasional false alarms and alarm setting changes.

Glucose Measurement Method

Dexcom G6 and G7 measure glucose levels in the interstitial fluid between cells using a tiny sensor inserted under the skin. This method provides continuous glucose readings without the need for routine fingersticks.

Glucose Measurement Range and Historical Data

Both systems accurately measure glucose levels within 40 to 400 mg/dL (2.2 to 22.2 mmol/L). They store up to 30 days of historical data, which can be reviewed using the Dexcom Clarity app.

FDA Approval

  • Dexcom G6: Received FDA approval in 2018.
  • Dexcom G7: Received FDA approval in December 2022.

Components and Training

Purchasing a Dexcom CGM system typically includes:

  • Sensors
  • Transmitter (integrated with the sensor in G7)
  • Receiver (optional, as data can be viewed on compatible smart devices)

Dexcom provides training materials and support to help users understand how to set up and use the system effectively.

Compatibility with Insulin Pumps and AID Systems

Dexcom G6 and G7 are compatible with select insulin pumps and Automated Insulin Delivery (AID) systems. It’s important to consult with your healthcare provider or Dexcom to confirm compatibility with specific devices.

Mobile Application and Data Viewing

Dexcom offers mobile applications for both CGM systems:

  • Dexcom G6 App: Displays real-time and historical glucose data.
  • Dexcom G7 App: Features a redesigned interface with Dexcom Clarity integration for comprehensive data analysis. Data is transmitted over a range of up to 20 feet.

Conclusion

Upgrading from Dexcom G6 to G7 depends on individual preferences, priorities, and tolerance for potential limitations. While G7 brings notable improvements, such as enhanced accuracy, streamlined connectivity, and a more compact design, users must weigh these benefits against factors like price, usability, and ongoing user experiences. As advancements continue in continuous glucose monitoring, Dexcom remains a crucial player, empowering individuals on their journey to diabetes management.