Continuous Glucose Monitors (CGMs) offer real-time glucose insights without frequent finger pricks. A common question concerns their compatibility with daily activities, especially showering. Understanding how CGMs interact with water is important for effective use and maintenance.
Understanding CGM Water Resistance
Most modern Continuous Glucose Monitors are designed with water resistance, allowing them to withstand certain levels of water exposure. It is important to distinguish between “water-resistant” and “waterproof.” Water-resistant means the device can resist water penetration to some degree, while truly waterproof implies complete imperviousness to water under all conditions, which is not typically the case for CGMs.
Manufacturers specify the depth and duration for which their devices maintain water resistance. For example, Freestyle Libre sensors are water-resistant up to 3 feet for 30 minutes. Dexcom G6 and G7 sensors are often rated for immersion up to 8 feet for approximately 24 hours. While routine activities like showering are generally within device capabilities, always consult your specific manufacturer’s guidelines.
Tips for Water Exposure
To maintain CGM integrity during showers, several practical steps can be taken. Before showering, ensure the sensor’s adhesive is securely attached. If recently applied, allow the adhesive to bond for a few hours before significant water exposure. Some users find it helpful to use an additional waterproof adhesive patch or tape over the sensor for enhanced security.
During the shower, avoid directing strong, forceful water streams directly onto the sensor site. A gentle flow is less likely to dislodge the adhesive or compromise the device. After showering, gently pat the area around the sensor dry with a towel instead of rubbing. Ensuring the skin around the sensor is completely dry helps prevent moisture from weakening the adhesive over time.
Troubleshooting Water-Related Issues
Despite precautions, issues can arise after water exposure. A common concern is the sensor’s adhesive peeling or loosening, which can shorten device wear time. If the adhesive peels, specialized overpatches or medical-grade tapes can re-secure the sensor. Do not attempt to reattach a fully detached sensor, as its accuracy and function may be compromised.
Water exposure, especially prolonged or at extreme temperatures, might temporarily affect glucose readings. If readings appear unusual or inconsistent after getting wet, monitor them closely and consider a finger-prick blood glucose check. If the sensor continues to provide inaccurate readings, or if there is skin irritation, contact the manufacturer’s support or your healthcare provider for guidance.
CGM Use Beyond Showers
While CGMs are designed for showering, other water activities present different considerations. Swimming, particularly for extended periods or in chlorinated water, can place greater stress on the sensor’s adhesive. Chlorine can weaken the adhesive bond, and prolonged immersion increases the risk of dislodgement. Using protective covers or extra adhesive patches is beneficial for these activities.
Hot tubs and saunas introduce heat and humidity, which can affect the adhesive and potentially sensor performance. Extreme temperatures, both hot and cold, can temporarily impact glucose readings, as the device operates best within a specific temperature range, typically between 50°F and 113°F (10°C to 45°C). Always check manufacturer guidelines for prolonged water immersion, especially in varying temperatures, to ensure accurate and reliable function.