The durability of a continuous glucose monitoring (CGM) system is one of the greatest concerns for those seeking to optimise their blood sugar control. It is not just about comfort, but an investment in health that must perform at its best.
To ensure that the device completes its full cycle without peeling off due to rubbing or sweat, it is essential to have a cover to extend the sensor’s lifespan that ensures its stability from day one.
How many days does each glucose sensor last?
In today’s market, the lifespan of these devices varies depending on the maker and the technological model. A glucose sensor is designed to stick to the body and provide accurate readings for a time strictly defined by its software and the stability of its reactive enzyme.
Below, we detail the useful life of the most commonly used models:
1. FreeStyle Libre 2
It is the gold standard in Spain and many other countries. This glucose sensor usually lasts 14 days (two weeks) from the moment it is activated. Once this period has passed, the sensor automatically deactivates to ensure that the measurements do not lose accuracy.
2. FreeStyle Libre 3
The latest version of the Libre family maintains a similar autonomy, although there are specific versions in certain markets that can extend its operation up to 15 days. It is smaller and more discreet, but its adhesive faces similar challenges during physical activity.
3. Dexcom G6 and G7
Unlike the Libre system, the Dexcom G6 lasts 10 days, while the new Dexcom G7 has maintained this standard but with an additional 12-hour grace period to ease sensor changes.
Comparison table of duration by model
| Glucose Sensor | Official Duration | Is it disposable? |
| FreeStyle Libre 2 | 14 days | Yes, single use |
| FreeStyle Libre 3 | 14 - 15 days | Yes, single use |
| Dexcom G6 | 10 days | Yes (reusable transmitter) |
| Dexcom G7 | 10 days + 12h | Yes, all in one |
What to do when the sensor’s lifespan ends
When the system notifies you that the cycle has ended, you should remove the device by peeling the adhesive pad off the skin. It is a simple process but requires care to avoid irritating the area.
If you have doubts about the correct procedure to avoid damaging your skin or how to clean off glue residue, we recommend consulting our detailed guide on how to remove the FreeStyle Libre 2 sensor safely and painlessly.
Factors that can shorten your sensor’s life
Although the maker guarantees 14 days, there are situations that can cause the sensor to stop working prematurely:
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Excess moisture: Although they allow activities like showering or exercising, prolonged exposure to water can weaken the adhesive pad.
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Accidental snags: Door frames and rubbing against clothing are the main foes of the FreeStyle Libre 2.
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Heavy sweating: In hot climates or during intense workouts, sweat can seep under the adhesive, causing it to come off before day 10.
Safety precautions and reminders
As specialists, we always recommend following these guidelines to maximise the effectiveness of your technology:
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Site rotation: As with insulin, always choose a different spot on the back of the arm to avoid irritation and fatty tissue changes.
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Skin preparation: The area should be free of excess hair, dry, and degreased with alcohol before application.
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Responsible disposal: At the end of its useful life, the sensor should be removed by peeling off the adhesive pad and discarded according to local electronic waste regulations.
Maximise your sensor’s lifespan with Glucody
Losing a sensor on the seventh or eighth day is a logistical and financial inconvenience. Most of these accidental losses can be avoided if the sensor has a reinforcement that keeps it stuck to the skin without relying solely on its own glue.
At Glucody, we understand that your pace of life does not stop. That is why we have designed solutions that act as a shield against knocks and sweat. Using a cover to extend the sensor’s lifespan not only gives you peace of mind during exercise but also ensures that your FreeStyle Libre 2 always reaches day 14 in perfect condition.
Our bands are the ideal alternative for those seeking security without irritating the skin with additional adhesive patches. Visit us and discover how our modern design accessories can help you live your diabetes with greater freedom.
