A Continuous Glucose Monitor (CGM) is a compact wearable device that tracks glucose levels throughout the day and night. It functions by measuring glucose in the interstitial fluid, found just beneath the skin. This provides real-time, continuous glucose readings, offering a dynamic view of how blood sugar levels fluctuate. The primary purpose of a CGM is to help individuals manage their glucose by providing instant insights, enabling informed decisions regarding diet, physical activity, and medication.
Approved Body Sites for CGM Placement
Continuous Glucose Monitors are placed on specific body areas that offer optimal conditions for accurate readings. The back of the upper arm is a widely approved and common site for many CGM systems. This area is favored due to its ample subcutaneous fat, where the sensor filament measures glucose. Additionally, it experiences less movement and is less prone to accidental bumping, which helps maintain sensor adhesion and accuracy.
Another frequently approved location is the abdomen. Similar to the upper arm, the abdomen often provides sufficient subcutaneous fat, making it suitable for sensor insertion. Placing the sensor on the abdomen can offer a discreet option. When considering the abdomen, choose an area away from the navel and waistband to avoid discomfort or dislodgement from clothing.
Some CGM systems may also approve other sites, such as the upper buttocks or thigh, depending on the specific device and manufacturer guidelines. These alternative sites are also selected for their subcutaneous tissue and stability.
Choosing the Optimal Site
Selecting the most suitable CGM placement site involves considering personal factors beyond just the approved locations. Individual comfort and lifestyle play a significant role. For instance, active individuals might prefer a site less likely to be impacted during exercise or daily activities, such as the outer part of the upper arm. Conversely, someone who sleeps on their stomach might find abdominal placement less comfortable or prone to compression.
Skin health at the chosen site is another important consideration. Areas with scar tissue, stretch marks, moles, or excessive hair should be avoided. These skin variations can interfere with sensor adhesion, cause discomfort, or affect the accuracy of glucose readings. It is advisable to rotate placement sites with each new sensor to allow the skin to heal and prevent irritation or scar tissue from repeated insertions.
Clothing and personal preferences for discretion also influence site selection. Some individuals may prefer a site easily concealed under clothing, while others might prioritize accessibility for scanning or viewing readings. Evaluating these personal aspects helps ensure the chosen site not only provides reliable data but also integrates comfortably into daily life.
Tips for Successful Application and Wear
Achieving successful CGM application begins with meticulous skin preparation. Before inserting the sensor, the chosen site must be clean and dry. Using an alcohol wipe and allowing it to air dry thoroughly helps remove oils and dirt, important for strong adhesive attachment. Applying the sensor to a clean, dry surface minimizes the risk of adhesive failing prematurely.
Once the skin is prepared, ensure the sensor is applied firmly and smoothly to promote optimal adhesion. Avoiding areas with significant muscle movement directly under the skin can help prevent discomfort and sensor dislodgement during daily activities. After application, press around the adhesive patch for a few seconds to ensure it is securely attached to the skin.
During the wear period, gentle care of the sensor site is recommended. While most CGMs are water-resistant and allow for showering and swimming, prolonged submersion or vigorous rubbing of the sensor area should be avoided. For exercise, consider applying an adhesive overlay or patch if available, especially for high-impact activities or excessive sweating, to provide extra security and prevent the sensor from detaching.