Can You Swim with a Continuous Glucose Monitor?

Have you ever jumped into the water and suddenly thought, “Is my CGM working?” If you’re a person who lives with diabetes, with a Continuous Glucose Monitor (CGM), it’s a fantastic question – maybe even a little more common than you think. Swimming is not only an enjoyable activity – but also a full-body exercise, a great way to unwind and for some a part of daily living or routine. If you are using a CGM, it is important to learn and discuss the impact that being in the water may have on your device. 

In this article, we will swim into every nook and cranny pun intended! CGM splash proof vs waterproof status, swimming and CGM effects, what to do in the water, and how to keep your device safe and reliable whether you’re doing laps, snorkeling or playing in the pool with the kids.

About CGM Water Resistance

Before you dive in, it’s important to consider how CGMs behave in water.

Water resistance in medical devices describes their ability to continue functioning when exposed to water. However it doesn’t mean it is waterproof. CGMs all have ratings based on the Ingress Protection (IP) Code, which is an international standard for classifying how devices are protected from water and other elements.

Typical Water Resistance Ratings for CGMs

Most CGM devices will have at least some water protection. For example:

• IP27: No Adjustment after dripping water falling and angled.
• IP28: When submerged for longer time periods to a greater depth (up to 2.4 meters). 

But again, even with a good rating, your CGM is still not going to be impenetrable. Never mind an hour in the pool, or swimming in salty ocean water, or deep diving with it.

Can You Swim with Popular CGM Devices? A Device-by-Device Breakdown

Dexcom G6 and G7

These are IP28-rated Dexcom models, which allow submersion in water at a maximum depth of 8 feet (2.4 meters) for a maximum of 24 hours. 

What this means for swimmers:

• Yes, you can swim with it on.
• It continues to function while swimming (or bathing).
• Prolonged exposure to salt water and chlorine will reduce the effectiveness of the adhesive. 
• It’s best to pat down the sensor after swimming. 

Freestyle Libre 2 and Libre 3

Both Freestyle versions are IPX7 rated for water resistance, meaning they can be submerged for 30 minutes in water at a maximum of 1 meter deep. 

Meaning for swimming or showering with Freestyle:

• It’s ok to swim or shower with Freestyle, provided you remain under 30 minutes and a meter deep.
• Swimming or scuba diving for an extended period of time is not recommended. 
• Swimming and saltwater/chlorine water exposure may deteriorate the adhesives over time. 

Eversense Implantable CGM

Eversense is quite different from the others because it is an implantable sensor that goes under the skin. 

Meaning for swimming with Eversense:

• There is a transmitter that the user wears, and this part is removable and water-resistant. 
• And because the sensor is under the skin, it offers the user more flexibility for swim and/or water-based activities. 
• The external part can be removed during swimming and then placed back onto the sensor afterwards.

How Swimming Affects CGM Adhesion and Sensor Performance

Swimming presents challenges for CGMs beyond being wet.

Adhesive Integrity

Most CGMs you might be using are based on adhesive patches. Here is the potential for swimming:

• Loss of stickiness in adhesive from exposure to water, sweat, and chlorine.
• Potential for the sensor to fall off prematurely.
• Skin rash/irritation.

Tips to improve adhesion during swimming:

• Use a waterproof adhesive patch or overlay.
• Prep skin with cleaning and drying.
• Use additional fixatives, barrier spray, and skin-prep solutions.

Sensor Accuracy and Signal Transmission

Water is not going to interfere with the detection of glucose directly, but:

• Going above water resistance could damage the transmitter.
• The signal to your phone or receiver could lessen, which may happen underwater.
• After swimming, CGM readings may be affected for a short period of time; watch for inaccurate readings.

Safety Considerations and Best Practices for Swimming with a CGM

To optimize your continuous glucose monitor (CGM) in the water, simply follow these quick tips:

1. Check the Manufacturer’s Instructions

Read the manufacturer’s user guide for your CGM before you get in the water. CGMs vary widely in water resistance specs in both how deep they can go and how long they can do it. Some models are likely only meant for splash protection and short dips (in a pool) to as deep as a few meters for longer swims. 

Paying attention to these specifications will help to keep your CGM operating correctly and reduce the risk of water malfunction.

2. Prepare Your Sensor Site

Prepping your skin before putting on your CGM sensor matters, particularly with frequent swimming. Your skin must be thoroughly cleaned and dried before you apply the sensor so the adhesive will bond properly. You might also want to use waterproof overlays, medical tape, or barrier wipes to enhance adhesion and reduce the likelihood that the sensor will fall off while you are in the water.

Properly consider your placement option to help with wearability. Positions that receive less friction at the time of swimming or have less impact from the water are ideal—like under a bathing suit or the back of your arm.

3. Post-Swimming Care

You should use a fresh towel to gently pat dry the sensor and surrounding skin once you have exited the pool or ocean. Do not rub or pull at the sensor site. Check to see if the adhesive is lifting from the skin or if there is any skin irritation. 

This is especially important after swimming in a pool or ocean water. Chlorine and salt may both compromise the adhesive and cause it to lift over time. If needed, reinforce the sensor adhesive with even more adhesive or tape to hold it in place and functioning correctly.

4. Monitor Your Glucose Readings

There are many temporary factors that may affect glucose levels post-swim; such as level of exertion, temperature of the water, and more. It would be smart to monitor your CGM readings before, during, and after your swim (if the opportunity allows you to). If you are noticing irregular readings now and after an extended outing in water, you may want to confirm your reading through a finger-stick test and check that your CGM is calibrated to read (if applicable).

Ultimately, you are responsible for your glucose readings and monitoring your device consistently allows you to ensure your device is helpful and experiencing less interference helps to keep you in optimal glucose control when swimming. 

Benefits of Swimming While Using a CGM

Swimming is a low-impact, heart-healthy workout, and with a CGM bringing an extra level of safety, it’s even better:

• Alerts in real-time to prevent hypoglycemia.
• Analyze patterns and adjust food taken or insulin given to you before and after workouts.
• Prevent sugar drops in prolonged swimming sessions.
• Increased confidence to participate in meaningful water activity.

Common Challenges People Face When Swimming with a CGM

Although today’s CGMs are much more swimmer-friendly than their predecessors, users report regularly encountering challenges, albeit these issues have been lessened!:

• Sensor detachment, as with frequent or aggressive swimming.
• Skin irritation: long-term adhesive and moisture retained in the adhesive can lead to a rash & discomfort.
• Device malfunction: this is rare but may occur if submersed beyond the IP rating.
• Signal loss: Bluetooth signals fail to transmit well through water.
• Fortunately, with some good care and supplies, most of these challenges can be easily addressed.

Alternative Solutions for Water Activities

If you are someone who swims on a regular basis, here are some suggestions:

• Opt for implantable continuous glucose monitors (CGMs) like Eversense to limit the number of wearables and improve peace of mind.
• Use waterproof covers or patches to cover your device.
• Take the transmitter off (if your device allows for that to happen) before you go swimming.
• Discuss with your physician your level of engagement in water sports and possible alternatives for you.

FAQs: Swimming and Continuous Glucose Monitors

1. Can I dive with my CGM?

Most continuous glucose monitors (CGMs) are rated for shallow water only. If you are diving deep, you may jeopardize the sensor or affect its performance.

2. Will chlorine ruin my CGM sensor?

Chlorine generally affects the adhesive and not the sensor itself, especially if there is limited exposure.

3. How long can I swim with a CGM on?

Typically, safe swimming is between 30 and 60 minutes. Check your device manufacturer for exposure time.

4. What if my CGM falls off while swimming?

Make certain to pack backups – spare sensors and adhesive tape will go a long way to save the day.

5. Can sweat affect CGM performance during swimming?

There may be some loosening of the adhesive from sweating, however, it will not affect the accuracy of the sensor. Ensure that the sensor sticks very well when applying.

Conclusion: Swim Confidently with Your CGM

Yes, you can wear a Continuous Glucose monitor while swimming — Most modern CGMs are designed as water-resistant and can handle being used in situations where they will be exposed to water. Though you may need to take more precautions to ensure your sensor stays adhered to and your device continues to provide data, the perks of swimming and continuous glucose monitoring far outweigh the minimal inconveniences you may experience.

Swimming is a great form of exercise for physical health, general health, and glucose management, and with a CGM, you will always know what your blood glucose levels are, even when you are in the pool.

Are you interested in options for a CGM that fit into your active lifestyle? 

Schedule a complimentary consultation with our expert care team at HealifyNow. We’re happy to answer all of your questions, help you determine what devices for CGMs might be best for you, and provide the trust needed to effectively manage your diabetes while being active in and out of water.

Evelyn Brown