Continuous glucose monitoring (CGM) has become a revolutionary tool for people with diabetes. These devices constantly track blood sugar levels to help manage the condition more effectively. One of the key components of a CGM is a sensor that is implanted under the skin. It measures glucose levels in the interstitial fluid. However, like any medical device, it has a specific service life, which must be taken into account to ensure accuracy and safety.
The actual lifespan of the sensor depends on individual physiological characteristics. Additionally, this non-invasive glucose monitor requires adherence to operating guidelines. Sticking to the CGM sensor replacement schedule plays a key role because it affects several factors:
Most CGM manufacturers specify the standard operating period for sensors in their instructions. These figures are based on laboratory tests.
Various factors influence the lifespan of a CGM sensor. These are related to individual physiological characteristics and the conditions under which the device is used. Taking these factors into account extends the sensor’s effective lifespan and reduces the risk of unwanted issues. The table below lists the key factors that affect the sensor’s lifespan.
| Factor | Description | Recommendations |
| Service Life | Manufacturers specify an operating time of 7–14 days, depending on the model | Replace periodically to ensure data accuracy |
| Individual skin reaction | Irritation, itching, or inflammation may occur with prolonged wear | Replace at the first sign of discomfort |
| Operating conditions | Sports, sweating, high humidity, or high temperatures can shorten the sensor’s lifespan | Avoid extreme conditions and secure the sensor firmly |
When replacing a CGM sensor, strictly follow the manufacturer’s recommendations, as the specified service life of the device is based on thorough research. Failure to adhere to these guidelines will result in reduced accuracy. If you notice discrepancies in the data, this indicates that the sensor needs to be replaced, even if its service life has not yet expired. Store sensors according to the manufacturer’s instructions, including temperature guidelines.
Users of CGM devices often have questions about how the devices work, the accuracy of the data, and sensor replacement. For those just starting to use these devices, it’s important to understand how to use them correctly and what to consider when taking measurements. In particular, many are interested in how to measure blood sugar most accurately and what steps to take if there is a discrepancy between the sensor and the glucose meter. There are several questions regarding sensor replacement.
Some users try to use it beyond the specified period by resetting it via the app or the device itself. However, this is not recommended, as data accuracy decreases significantly after the sensor’s service life has expired.
If it has come loose but continues to work, you can secure it with a special adhesive patch. If it has stopped transmitting data, it should be replaced.
Most readers are designed for single-use only. Reusing the sensor not only reduces data accuracy but also increases the risk of infection.
Regularly replacing your CGM sensor ensures accurate glucose monitoring and a comfortable user experience. To get the most out of your glucose monitoring system, follow the manufacturer’s recommendations and pay close attention to your health.
