Reusable CGM sensors – Safe or Unsafe?

Reusable CGM sensors sound convenient and eco-friendly, but currently, most are designed for single use to ensure accuracy and prevent infections. Using them more than recommended can affect glucose readings and irritate the skin. In the future, safer reusable options may become available, but for now, it’s best to follow the manufacturer’s guidelines. Although this blog focuses on reusable CGM sensors, most people living with diabetes are likely already familiar with Continuous Glucose Monitors (CGMs). Just a quick recap on CGM systems for those who might not be aware of the CGM technology.

CGM systems provide you with continuous glucose monitoring without the need for repeated finger pricks. These systems have significantly helped people get more control over their glucose levels with less effort. The top CGM manufacturers include, but are not limited to, Dexcom and Abbott.

How Long Can I wear a CGM sensor?

The duration for which a CGM sensor can be worn varies based on the specific model and advancements in technology. As of 2025, most CGM sensors, such as the Abbott FreeStyle Libre 3, are designed for a 14-day wear period. However, the upgraded Libre 3 Plus and Dexcom G7 Sensors offer an extended wear time of up to 15 days, making them a favourite among users.  You are surprised to learn that the Eversense 365 system offers a significant leap forward, providing up to 365 days of continuous glucose monitoring with a single sensor.

These advancements aim to enhance user convenience and reduce the frequency of sensor replacements. It’s important to note that while these extended wear times are approved, users should always adhere to the manufacturer’s guidelines and consult with healthcare providers to ensure optimal sensor performance and accuracy.

2025 CGM Sensor Models and Wear Durations

CGM technology has advanced rapidly, offering users longer wear times, improved accuracy, and seamless integration with insulin delivery systems. As of 2025, a variety of CGM models are available from different companies like Dexcom and Abbott, each designed to cater to various needs, ages, and lifestyles. Here’s a comprehensive overview of the latest CGM sensor models and their wear durations:

When to Remove the Sensor

• If the sensor becomes loose or its tip comes out of your skin, you may receive no readings or unreliable readings that do not match your actual condition. Check to make sure your Sensor has not come loose. If it has come loose, remove it and apply a new one.
• If you believe your glucose readings are not correct or are inconsistent with how you feel, perform a blood glucose test on your finger to confirm your glucose. If the problem continues, remove the current Sensor and apply a new one.
• When applying a new sensor, try changing the sensor site to avoid any discomfort.

Important

When applying a new sensor, make sure you follow the proper instructions, such as cleaning and drying the site and avoiding places with moles or lumps. In case the sensor breaks or causes irritation, please contact your healthcare specialist.

Conclusion

While many of you would be in search of reusable CGM sensors, reusing a CGM sensor is not recommended. Reusing a CGM sensor may result in incorrect readings and infections as well. Each CGM sensor is designed with a specific lifespan in mind—for instance, the Libre 3 sensor can last up to 14 days, while the Dexcom G7 typically lasts 10 days, with a 12-hour grace period. It’s important to adhere to these timeframes for optimal performance. Change the sensor before it becomes loose, malfunctions, or irritates.

At the time of applying a new sensor, change the application site to avoid any discomfort or irritations.