I Tested Several Glucose Sensors – Here’s My Conclusion

Glucose Monitoring with Sensors Has Radically Changed the Way People with Diabetes Can Manage Their Condition. Beyond the simple comfort of avoiding repeated finger pricks, these sensors provide continuous data, detailed graphs, and the ability to better understand the impact of diet, treatment, and physical activity on blood glucose. I have tested several models available on the market and drawn my own conclusions. Everything that follows strictly represents my personal experience and how I perceived each sensor. It is not an official guide, not an absolute recommendation, and certainly should not be interpreted as direct criticism of any manufacturer. My intention is to share these observations so that patients can have a clearer picture when making informed decisions.

Dexcom – Stability and Safety with Transmitter

Dexcom is a well-known and highly regarded sensor worldwide. In Romania, it has been on the market for a long time and is available through the national program in regional diabetes centers. I initially tested the older version with a transmitter. The glucose values were extremely accurate and, in 90% of cases, identical to those measured with the glucometer. I was pleasantly impressed by its accuracy. The transmitter version is no longer available in Romania, even though I found it very precise. I also tested the new integrated version, where the transmitter is included in the sensor. However, there were times when the difference between the glucometer reading and the sensor value was completely inconsistent. Overall, the new sensor seemed accurate, but it disappointed me by about 30%, especially because I had been used to the high accuracy of the old version.

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Linx – A Less Satisfying Experience

When I first saw the Linx advertisement, it struck me as quite a faithful copy of Abbott’s FreeStyle sensor. Linx seems to position itself as a more affordable alternative, but the manufacturers are different. Linx is produced in China. I want to emphasize from the beginning that what follows is not an absolute statement, but only my personal perception after testing. Compared to other sensors, my experience with Linx was not at the same level of comfort.

From a design perspective, it appears inspired by established models, but in practice I noticed several aspects that, for me, were negative: the connection stability was not consistent, the app did not feel as intuitive, and the sensor’s lifespan did not provide the same satisfaction. I tested several sensors and some deactivated before the end of their intended usage period.

Furthermore, when I contacted the manufacturer, instead of replacing the faulty sensor, they offered me a discount on the purchase of a new one, with the discount reflecting only the remaining days of the sensor. I did not find this fair, especially since I no longer wanted to buy another sensor, and in fact, I didn’t.

As for the readings, the glucose values displayed by the sensor were quite close to those of the glucometer. However, unfortunately, the adhesive that helps the sensor stick to the skin caused me a local allergic reaction — not severe, but very visible and somewhat bothersome. I do not deny that I am allergic to common medical adhesives, so if you are like me, be cautious.

Also, most of the time when I tried to calibrate it, the device sent me a message that it was not connected to Bluetooth, even though it was perfectly connected. Again, I am not saying that the device does not work, but for me, it presented several disadvantages. Other users may have a different experience, but in direct comparison with other sensors, Linx felt below expectations.

FreeStyle – Lack of Availability in Romania

FreeStyle is a globally recognized brand, highly appreciated in many countries. Unfortunately, it is not officially available in Romania. This was the reason why I personally did not test it. I find it frustrating that such a successful international product cannot be purchased and used in our country, especially when patients would benefit from a wider variety of options. Its absence from the local market is a real inconvenience and raises questions about access to modern medical technology. It is difficult to understand why a globally validated sensor is not available here. For me, this was reason enough not to include it in my practical tests, since the experience would have been incomplete and inconclusive.

Roche – Bulky but Very Accurate

The Roche sensor surprised me with the accuracy of its readings. It is true that, at first glance, its size seems larger compared to other sensors. From an aesthetic and practical perspective, it is not the most discreet device. However, once you get used to it, accuracy becomes the most important factor. The values are very close to reality, which inspires confidence. In a world where even small differences can influence major medical decisions, a sensor that consistently shows correct results is an undeniable advantage. From my perspective, Roche still needs improvements in design and comfort, but when it comes to accuracy, it ranks very high. I am also convinced that this serious manufacturer will improve the app, which, compared to competitors’ apps, is currently inferior.

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Sibionics – A Big Step Forward with GS3

I had the opportunity to test several Sibionics models and was impressed. GS1 was a stable, reliable sensor with simple use and satisfactory precision. However, GS3 clearly changed my perception. I consider it a superior product—more modern, more comfortable, and safer. My experience with GS3 was excellent in every way. I appreciated the ease of insertion, the stability of the connection, and the consistent and trustworthy readings. In my view, GS3 is one of the best sensors I have tested and is currently one of my favorites. At present, only the GS1 model is active in Romania, but even this one remains a good and stable sensor.

Important Practical Aspects

One element worth mentioning is sensor lifespan. There are clear differences between models—some last 10 days, others 14, or even longer. For users, every extra day matters, both in terms of comfort and cost. Another important factor is calibration—some sensors still require periodic checks with a glucometer, while others are fully factory-calibrated. From my perspective, a sensor that does not require calibration is more convenient, but absolute accuracy remains the key criterion.

App compatibility is also an important consideration. Not all models integrate seamlessly with all operating systems or smartphones. From my experience, official apps work well on modern phones but may have difficulties on older devices.

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My Personal Conclusion

After testing several sensors, I can say that each one has its strengths and weaknesses:

• Dexcom with transmitter gave me stability and confidence, but it is no longer available.
• Linx, though more affordable, did not convince me in terms of user experience.
• FreeStyle is globally appreciated, but its absence in Romania is a major drawback.
• Roche impresses with accuracy, even if its size is larger.
• Sibionics GS3 won me over and is, in my opinion, one of the best options I have tested.

These conclusions are not absolute, and each user may have a different experience. My intention was to share my own impressions so that interested individuals have more information at hand when choosing. The market is constantly evolving, new technologies are emerging, and the future of glucose sensors is undoubtedly a promising one.

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