Can the glucose sensor get wet? A guide to protecting it in water

One of the most common questions among continuous monitoring users is whether water activities can compromise the accuracy or adhesion of the device.

The short answer is yes, modern sensors are water-resistant, but there are technical limits you should know to avoid losing your investment. For added safety, the use of sensor protective bands helps keep the patch in place even under the most demanding wet conditions.

Water resistance of glucose sensors

Current sensors are designed to fit into the active life of the patient, allowing everyday activities without needing to remove the device. However, resistance varies by brand:

• FreeStyle Libre (1, 2, and 3): They are water-resistant up to a depth of 1 meter for a maximum of 30 minutes.

• Dexcom Systems: Some models offer broader specifications, withstanding up to 2.4 meters deep for 24 hours.

It is essential to always check the specific manufacturer’s manual, as exceeding these limits can affect both the adhesive’s hold and the integrity of the electronic measurement.

What can I do with my glucose sensor?

Daily shower and bath

You can shower and bathe normally with the sensor on. The adhesive is made to withstand soap and running water. However, avoid rubbing the area directly with a sponge to prevent accidental detachment.

Swimming in pool and sea

Swimming is possible, but you must respect the depth and time limits mentioned above (especially the 30 minutes for FreeStyle). An important technical detail is that Bluetooth performance may be affected while the sensor is underwater, which could interrupt real-time readings until you surface.

Comparison of water resistance

Tips to maximize adhesion underwater

For the sensor to last its full lifespan, which is generally 14 days, skin preparation is key:

1. Clean and dry skin: Before application, make sure the area is free of creams, oils, or moisture residue.

2. Avoid excessive hair: A clear area allows the medical glue to adhere directly to the skin.

3. Moisture control: If you plan to swim, it is advisable not to apply the sensor just before entering the water; wait a few hours for the adhesive to set properly.

Remember that if the sensor detaches prematurely, you will lose the glucose data for that cycle. You can check how long a glucose sensor lasts on our specialized blog to better understand its replacement cycle.

Physical exercise and sweat

The sensors are suitable for running, cycling, and high-intensity training. However, excessive sweat is a factor that can "soften" the original patch adhesive.

In these cases, it is vital to perform a site rotation with each change to avoid accumulated irritation from moisture and friction. At the end of the 14 days of use, make sure to follow the correct process on how to remove the FreeStyle Libre 2 sensor to avoid damaging your skin after prolonged water exposure.

Protect your water freedom with Glucody

Knowing that the glucose sensor can get wet brings great peace of mind, but the fear of it coming off in the pool or sea is always present. A snag on the swimsuit or constant rubbing with the water can end in a wasted sensor.

At Glucody, we have designed the ultimate solution for athletes and active people. Our sensor protective bands add a layer of physical security that keeps the sensor firmly in place no matter how many hours you spend in the water or how much you sweat at the gym.