In the US., the Dexcom G7 and the Libre 3 fall among the top continuous glucose monitoring systems (CGM systems). These smartphone-compatible CGM systems can be used with their specific readers or connected to compatible smartphones. Both fall under the category of real-time continuous glucose monitors (rtCGM); here, the real-time CGMs relate to the ones transmitting glucose data to the reader or your smartphone without you even touching the sensor or your receiving device. When discussing Dexcom G7 VS Libre 3, major aspects one needs to ponder include MARD value, age requirements, life-span of the sensor, AID compatibility (if required), and more. This blog covers all these aspects and a bit more.

Dexcom G7 VS Freestyle Libre 3 Accuracy & Age Requirements:

The accuracy of a CGM is measured by its mean absolute relative difference (MARD) percentage. The MARD value measures the percentage difference between blood glucose meter and continuous glucose meter results. The lower the difference, the better the accuracy.

While measuring the accuracy, this should be kept in mind that CGM manufacturing companies like Abbott or Dexcom suggest specific sites for the CGM sensors to be inserted. It is important to wear the sensor accordingly, otherwise, the accuracy may vary.

Dexcom G7 Accuracy & Age Requirements:

Suitable for individuals ages 2 and above, these sensors are designed to be inserted on the back of the upper arm. While in kids between the ages of 2 – 6, these sensors can be inserted on the upper buttocks, the company suggests the best accuracy on the back of the upper arm.

These sensors have an MARD value of 8.2%.

Freestyle Libre 3 Accuracy & Age Requirements:

Suitable for individuals ages 4 and above, these sensors are designed to be inserted on the back of the upper arm. Abbott says, to ensure accurate results and functionality, it is crucial to apply these sensors on the back of the upper arm.

These CGM sensors boast a MARD value of 7.8%.

Life-Span of the Dexcom G7 and Libre 3 Sensor:

A Dexcom G7 sensor lasts up to 10 days and 12 hours (grace period). Once your sensor expires, the grace period shall start, giving you a chance to set up your new sensor in time and avoid waiting for warm-up time. Whereas, a Freestyle Libre 3 Sensor lasts for up to 14 days.

It should be kept in mind that, if inserted correctly, your sensor lasts the longest when it is applied/inserted following proper guidelines. Moreover, applying a CGM Patch keeps your sensor firmly attached, leaving no space for it to get loose.

AID Compatibility:

Automatic Insulin Development (AID) compatibility is the ability of a CGM sensor to be integrated with an automatic insulin pump. Some of the CGM sensors are AID compatible, while others are not. Modern AID systems come with both options, auto insulin boluses (based on CGM readings) and manual insulin boluses, where the users can take boluses with just one touch on their smartphone’s screen.

Dexcom G7:

This sensor is AID compatible. It can be connected to the most automatic insulin pumps, i.e., iLet Beta Bionics insulin pump, Omnipod 5, Tandem Mobi, and t: slim X2 insulin pump.

Freestyle Libre 3:

The FreeStyle Libre 3 sensor is not compatible with any automated insulin delivery (AID) systems in the USA. Among Freestyle CGMs, the Libre 2 Plus and Libre 3 Plus are currently AID compatible.

More to Consider When Choosing a CGM Sensor:

Although continuous glucose monitors, whether Dexcom G7 or Freestyle Libre 3, simply monitor blood sugar and transmit the data over to the receiver or connected smartphone, understanding small differences can help you select the right CGM sensor.

Dexcom G7:

Suitable for type 1, type 2, and even gestational diabetes. This sensor gives urgent low alerts 20 minutes before your blood sugar even goes down, thus, especially suitable for anyone with hypoglycemic conditions. The size of the transmitter installed CGM sensor is 27mm x 23mm x 4.7mm. The reader’s size is 93mm x 23mm x 12mm, and its battery lasts up to 7 days.

Freestyle Libre 3:

Suitable for type 1, type 2, and gestational diabetes. With an approximate size of two stacked pennies, this is the tiniest yet most accurate sensor in the world. It has a diameter of 21mm and a height of 2.9mm. With 4 days of typical use, the Libre 3 reader size is 95 mm x 60 mm x 16 mm.

Dexcom G7 vs Libre 3 Sensor

Here are the important features required to compare Dexcom G7 and Freestyle Libre 3:

Conclusion:

While discussing Dexcom G7 versus Libre 3, it should be kept in mind that the selection of either depends on your requirements. In case you suffer from extremely low blood sugar levels (hypoglycemia), going for the Dexcom G7 may be a better option, since it gives you low glucose alerts 20 minutes before it even goes down. While people who prefer better accuracy or a longer lifespan may go towards the Freestyle Libre 3.

Disclaimer: This blog is only for informational purposes. Always consult your healthcare expert before taking any medical action.