Freestyle Libre 3 vs. Dexcom G7 System Comparison

When it comes to continuous glucose monitoring (CGM) systems, the Freestyle Libre 3 and the Dexcom G7 are two of the leading options available. These advanced systems offer real-time glucose monitoring, aiding in better blood sugar management for people with diabetes. This guide compares the features, specifications, and key aspects of these CGMs to help you decide which one might suit your needs best.

CGM Comparison Chart

Feature/Specification	Freestyle Libre 3	Dexcom G7
Size	Smaller than two stacked pennies	Small, size of a coin
Compatibility	Android and iOS devices	Android and iOS devices
Accuracy	MARD - 9.2%	MARD - 8.7%
Alerts and Alarms	Optional alarms for high/low glucose	Customizable alerts, predictive alerts
Frequency of Readings	Every minute	Every 5 minutes
Wear Time and Grace Period	14-day wear	10-day wear, 12-hour grace period
Price	Sensor: $230/month, Reader (optional): $150	Sensor: $400/month, Reader (optional): $200
Sensor Memory Storage	14 hours	24 hours
Application	Back of upper arm	Abdomen or upper arm
App Software	Freestyle LibreLink app	Dexcom G7 app
Bluetooth Range	33 Feet	20 Feet
Warm-Up Period	60 minutes	30 minutes
Body Locations	Back of upper arm	Abdomen, upper arm
Waterproof/Water Resistance	30 minutes at 30 feet	24 hours at 8 feet

Features and Specifications

Freestyle Libre 3 System

• Size: Compact and discreet, approximately the size of two stacked quarters.
• Compatibility: Works with Android and iOS devices.
• Accuracy: Delivers near real-time glucose readings every minute, known for its precision.
• Alerts: Optional alarms for high and low glucose levels.
• Reading Frequency: Measures glucose levels every minute.
• Wear Time: 14-day wear with a brief grace period for replacing the sensor.
• Price: Typically more budget-friendly, though costs may vary based on insurance.
• Sensor Memory: Holds up to 8 hours of data.
• Application: Worn on the back of the upper arm.
• App: The Freestyle LibreLink app offers insights, trends, and reports.
• Bluetooth Range: Limited but sufficient for daily use.
• Warm-Up Period: 1-hour warm-up after applying the sensor.
• Body Placement: Specifically designed for the back of the upper arm.

Dexcom G7 System

• Size: Smaller than the previous G6 model, about the size of a coin.
• Compatibility: Compatible with a wide range of Android and iOS devices.
• Accuracy: Highly accurate with a MARD (Mean Absolute Relative Difference) of around 8.7%.
• Alerts: Customizable, including predictive alerts that anticipate glucose trends.
• Reading Frequency: Provides glucose readings every 5 minutes.
• Wear Time: 10-day wear with a 12-hour grace period for sensor replacement.
• Price: Generally more expensive, with costs varying depending on insurance.
• Sensor Memory: Can store up to 8 hours of data if out of range.
• Application: Can be applied to the abdomen or upper arm.
• App: The Dexcom G7 app provides real-time data, insights, and trend analysis.
• Bluetooth Range: Extended range, offering more flexibility.
• Warm-Up Period: 30-minute warm-up period.
• Body Placement: Can be worn on the abdomen or upper arm.

Key Comparisons

Accuracy and Reading Frequency

The Freestyle Libre 3 has a MARD (Mean Absolute Relative Difference) of approximately 9.2%, indicating its high level of accuracy in glucose monitoring. MARD is a key measure that represents the average difference between the CGM's readings and actual blood glucose levels, with a lower percentage signifying greater accuracy. In comparison, the Dexcom G7 boasts a slightly better MARD of around 8.7%, making it one of the most accurate CGMs available. Both systems provide reliable glucose readings, with the Dexcom G7 offering a slight edge in accuracy.

Alerts and Alarms

The Dexcom G7 system stands out with more advanced alert options, including predictive alerts that notify users before glucose levels become too high or low. The Freestyle Libre 3 also offers alarms, but they are less customizable than those on the G7.

Wear Time and Comfort

The Freestyle Libre 3 sensor has a longer wear time of 14 days, compared to the 10-day wear time of the Dexcom G7. However, the Dexcom G7 sensor requires only a 30-minute warm-up period, which is a notable convenience when switching sensors.

CGM Cost

The Freestyle Libre 3 system is generally more affordable, appealing to those who prioritize cost-effectiveness. The Dexcom G7, though pricier, includes enhanced features that might justify the extra cost for some users.

Application and Sensor Placement

Both systems are easy to apply and can be worn on the upper arm. The G7 sensor additionally offers the flexibility to be worn on the abdomen, giving users more options for placement.

App and Data Management

Dexcom G7 Mobile App

Both devices come with intuitive apps—Freestyle LibreLink for the Libre 3 Reader and the Dexcom G7 app for the G7. These apps offer comprehensive data analysis and trends, and they are compatible with various devices for easy data access.

FreeStyle Libre 3 App

Bluetooth Range and Connectivity

The Dexcom G7 sensor features an extended Bluetooth range, useful for those who need to monitor their glucose levels from further away. The Freestyle Libre 3's Bluetooth range is shorter but typically sufficient for most daily activities.

Conclusion

Deciding between the Freestyle Libre 3 CGM and Dexcom G7 CGM ultimately comes down to your personal needs and preferences. The Freestyle Libre 3 sensor is a strong choice for those seeking an affordable, user-friendly CGM with real-time glucose monitoring and longer wear time.

On the other hand, the Dexcom G7 receiver offers advanced features like predictive alerts, a shorter warm-up period, and more flexible sensor placement. Although it may come at a higher cost, these benefits might be worth it for those who need more detailed and proactive glucose management.

Both CGMs provide reliable and accurate monitoring, helping you effectively manage diabetes. Consider your lifestyle, budget, and specific needs to determine which option is the best fit for you.

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