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When using the FreeStyle Libre glucose monitoring system, it's important to be aware of certain risks to ensure your safety:

Reader Device Safety

The FreeStyle Libre reader uses a lithium-ion battery, similar to those in many electronic devices. Improper charging or exposure to liquids can lead to battery swelling, overheating, or, in rare cases, fire. To minimize these risks:

• Use Only Provided Accessories: Always charge the reader with the Abbott-supplied USB cable and power adapter. Using third-party chargers can increase the risk of overheating and fire.

• Avoid Liquid Exposure: Keep the reader, USB cable, and power adapter away from water or other liquids. Exposure can damage the device and pose safety hazards.

• Proper Storage: Store the reader in a dry place, avoiding extreme temperatures. The recommended storage temperature is between -4°F and 140°F.

Sensor Application and Use

• Skin Sensitivity: Some users may experience skin irritation from the sensor's adhesive. If significant irritation occurs, remove the sensor and consult your healthcare professional before continuing use.

• Sensor Placement: Apply the sensor only to the back of the upper arm. Placing it elsewhere may result in inaccurate readings or device malfunction.

• Physical Activity: Intense exercise can cause the sensor to loosen due to sweat or movement. If the sensor becomes loose or the tip is coming out of your skin, you may get no readings or unreliable low readings. Remove and replace the sensor if it starts to loosen.

General Precautions

• Device Integrity: Do not use the system if any components appear damaged. Using damaged equipment can lead to inaccurate readings or device failure.

• Age and Health Conditions: The system is not approved for use in individuals under 4 years of age, those on dialysis, or critically ill patients. Its performance in these groups has not been evaluated.

By following these guidelines, you can use the FreeStyle Libre system safely and effectively.

When using the FreeStyle Libre system to monitor glucose levels, it's important to be aware that certain substances can interfere with sensor readings, potentially leading to inaccurate results. One notable example is ascorbic acid, commonly known as Vitamin C. Consuming standard doses of vitamin C is generally safe and does not affect the sensor's accuracy. However, taking amounts higher than the recommended daily allowance may cause the sensor to display glucose readings that are higher than actual blood glucose levels.

Additionally, other substances have been identified that may impact the performance of continuous glucose monitoring (CGM) systems like the FreeStyle Libre. For instance, studies have shown that certain medications and dietary components can cause significant deviations in sensor readings. These include Acetaminophen (commonly used for pain relief), which can lead to falsely elevated glucose readings, and substances like xylose, a sugar found in some foods, which can also interfere with sensor accuracy.

Given these potential interactions, it's crucial to remain vigilant. If your sensor readings do not align with how you feel or if you experience symptoms that don't match the glucose levels displayed, it's advisable to perform a finger-stick blood glucose test to confirm your actual blood sugar level. This step ensures that you make informed decisions about your diabetes management. Always consult with your healthcare provider if you have concerns about how medications, supplements, or dietary choices might affect your CGM readings.