The glucose sensor is changed every 10 or 14 days depending on the model. The FreeStyle Libre 2 and 3 last 14 days, the Dexcom G6 lasts 10 days, and the Dexcom G7 lasts 10 days with an additional 12-hour grace period. Once this time has elapsed, the sensor automatically deactivates and must be replaced with a new one.
To ensure the device completes its full cycle without peeling off due to friction or sweat, it is essential to use a protective patch for the glucose sensor that secures 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 manufacturer and technological model. A glucose sensor is designed to adhere 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 lifespan 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 of activation. Once this period has passed, the sensor automatically deactivates to ensure 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 facilitate sensor changes.
Comparative duration table 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 |
When exactly to change the sensor
The device itself alerts you: you will receive a notification in the app or on the reader when the cycle is about to end. There is no visible physical signal; it is the sensor’s software that deactivates upon reaching the manufacturer’s day limit.
As a practical rule, always keep a spare sensor at home so you don’t run out of coverage on change day. And from the moment you place the new sensor, put a protective patch on top so the adhesive holds for the full days without peeling off prematurely.
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 adhesive residue, we recommend consulting our detailed guide on how to safely and painlessly remove the FreeStyle Libre 2 sensor.
Factors that can shorten your sensor’s life
Although the manufacturer guarantees 14 days, there are situations that can cause the sensor to stop working prematurely:
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Excessive moisture: Although activities like showering or exercising are allowed, prolonged exposure to water can weaken the adhesive pad.
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Accidental snags: Door frames and clothing friction are the main enemies of the FreeStyle Libre 2.
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Intense sweating: In hot climates or during high-intensity workouts, sweat can seep under the adhesive, causing it to peel off before day 10.
Safety precautions and reminders
As specialists, we always recommend following these guidelines to maximize 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 lipodystrophies.
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Skin preparation: The area should be free of excessive hair, dry, and degreased with alcohol before application.
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Responsible disposal: At the end of its lifespan, the sensor should be removed by peeling off the adhesive pad and disposed of according to local electronic waste regulations.
Maximize your sensor’s lifespan with Glucody
Losing a sensor on the seventh or eighth day is a logistical and economic inconvenience. Most of these accidental losses can be avoided if the sensor has reinforcement that keeps it stuck to the skin without relying solely on its own glue.
At Glucody, we have designed protective patches for glucose sensors that act as a shield against sweat, water, and impacts, ensuring your sensor always reaches the last day in perfect condition. Compatible with FreeStyle Libre 2 and 3, Dexcom G6 and G7, hypoallergenic, and available in multiple colors and designs.
