In the Dexcom G7 vs. FreeStyle Libre 3 debate, understanding the essential role of continuous glucose monitoring (CGM) systems becomes critical for many diabetic patients. Taking blood glucose readings every day enables the physician to get a better understanding of the patient’s disease state which could be further improved by changing the dosage regimen.
For this purpose, CGM sensors are often used. In this comprehensive review and user guide, we will delve into the Dexcom G7 vs. FreeStyle Libre 3 comparison to determine which of these advanced CGM systems offers superior performance and benefits for diabetic patients.
Fluctuations in Blood Glucose Levels
In Healthy Individuals
All of us go through multiple glucose peaks and valleys in our blood on a daily basis. Every time we eat something, our blood sugar starts increasing until a peak is reached. After some time, our blood glucose levels start decreasing again until we consume food once again only to go through the same cyclic activity.
In Diabetics
In diabetic patients, the glucose levels fluctuate even more rapidly. Their blood glucose values might shoot immediately even after a small meal followed by a quick crash. That’s why, people who have diabetes often suffer from altering energy levels.
When considering Dexcom G7 vs. FreeStyle Libre 3, it’s important to note how these systems track the rapid fluctuations in blood glucose levels
Management of BGL
However, these crashes can be managed if the patients keep track of their BGL by taking glucose readings frequently. The only hindrance is that for every measurement, a fresh blood sample is required which makes the patient uneasy.
Use of Sensors for Continuous Glucose Monitoring
Continuous glucose monitors have solved this problem by facilitating the measurement of blood sugar levels multiple times a day without the need for frequent pricking.
Moreover, a CGM system works by calculating the mean absolute relative difference (MARD) which is done by comparing the CGM values with the capillary blood glucose measurements. The lower the value of absolute relative difference, the higher the accuracy of the device.
These continuous glucose monitoring systems include sensors such as Dexcom G7 as well as FreeStyle Libre 3 both of which have their own advantages and limitations.
Continuous Glucose Monitors: Specifications
Exploring the Dexcom G7 vs. FreeStyle Libre 3 further, let’s examine the distinctive features of each CGM system to understand their impact on daily diabetes management:
Features of Dexcom G7 Sensor
Dexcom G7 is a CGM system that has recently received FDA approval after previously being approved in Europe. This system has the following specifications:
● 60% slimmer than its previous version i.e. Dexcom G6
● 1-piece application system
● Takes BGL readings every 5 minutes
● The warm-up time is 30 minutes
● Sensors start as soon as it is applied
● MARD for arm placement is 8.2% while has a 9.1% value when the sensor is placed on the abdomen
● Suitable for patients as young as 2 years of age
● The lifespan of the sensor is up to 10 days
● Suitable for patients with type 1 or type 2 diabetes
● Has approval for use in pregnancy for gestational diabetes
● No need to save a separate transmitter as the device can keep the readings secured
● 12-hour grace period before the sensor is replaced
● Bluetooth range up to 20 feet
● Compatible with automated insulin delivery devices
● Easily connects with the Dexcom G7 app which is compatible with iOS and Android devices
Features of FreeStyle Libre 3 Sensor
FreeStyle Libre 3 is a blood glucose meter manufactured by Abbott which was approved by the FDA in May 2022. This continuous glucose monitor has the following characteristic features:
● Sleek and smart in design
● Weighs only 1.1 grams
● 70% smaller than other CGM sensors
● Sensor warm-up time is 60 minutes
● The sensor needs to be scanned to start the device
● Easy to wear using a 1-piece applicator
● No over patch required during application
● Highly affordable
● Takes readings every minute
● MARD value is less than 8%
● Real-time glucose alarm alerts are optional
● Sensor lifespan up to 14 days
● Sensor memory life up to 14 days
● Bluetooth range up to 33 feet
● Suitable for patients as young as 4 years of age
● Suitable for diabetes type 1 and 2
● Has suitability for pregnant women who have gestational diabetes
● 41% less plastic consumption during its construction
● Comes with a FreeStyle Libre 3 app which has compatibility with Android as well as iOS devices
Dexcom G7 vs. FreeStyle Libre 3: Comparison
In our Dexcom G7 vs. FreeStyle Libre 3 detailed comparison, we assess critical parameters side by side, as presented in the following table, to guide you in choosing the most suitable CGM system for your needs:
| Parameters | Dexcom G7 | FreeStyle Libre 3 |
| Warm-up period | 30 minutes | 60 minutes |
| Sensor lifespan | Up to 10 days | Up to 14 days |
| Time between the readings | 5 minutes | 1 minute |
| Low BGL alert system | Present | Present |
| Duration of water resistance | 24 hours at 8 feet depth | 30 minutes at 30 feet depth |
| Chemicals interfering with the readings | Panadol | Vitamin C |
| Smartphone connectivity | Present | Present |
Evidence-Based Accuracy Comparison
A study published in the Journal of Diabetes Science and Technology in 2024 has conducted a thorough comparison between the accuracies of Dexcom G7 vs. FreeStyle Libre 3. It was concluded after the experiments that FreeStyle Libre 3 gives more accurate readings than the Dexcom G7 sensor.
User’s Guide for Applying CGM Sensors
A CGM sensor is attached on the lower side of the forearm or on the abdomen. An applicator is employed to attach the device to the skin which is then kept in place with the help of an adhesive tape. Based on the instructions provided with the device, one might need to run a scan to activate the system. As soon as the sensor starts working, BGL readings can be observed on the patient’s mobile screen.
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Conclusion
In the past few years, CGM systems have become essential for those suffering from diabetes. The physicians recommend a continuous blood sugar measurement so that a complete pattern of glucose fluctuations can be observed. For this purpose, sensors like Dexcom G7 as well as FreeStyle Libre 3 have been introduced in the US.
After comparing Dexcom G7 vs. Freestyle Libre 3, it can be concluded that both of these sensors have their own distinct features which, despite varying from each other, are equally effective in their performance.
Purchasing medical devices from reliable vendors like Health Supply 770 ensures the provision of quality products along with satisfactory services.
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References
https://doi.org/10.1177/19322968231225676
PhD Scholar (Pharmaceutics), MPhil (Pharmaceutics), Pharm D, B. Sc.
