From the Guidelines
The optimal location for placing a continuous glucose monitor (CGM) sensor is the abdomen, specifically at least 2 inches away from the navel and insulin injection sites, as it provides the most stable and accurate readings. When selecting a site for CGM sensor placement, it is essential to consider the individual's circumstances, preferences, and needs, as stated in the 2024 standards of care in diabetes 1. The choice of device and placement location should be made based on these factors. Some key points to consider when placing a CGM sensor include:
- Choosing a flat area with adequate subcutaneous fat that doesn't experience excessive movement during daily activities
- Rotating insertion sites with each sensor change (typically every 7-14 days depending on the device) to prevent skin irritation and maintain accuracy
- Avoiding areas with significant muscle movement, scarring, or insufficient fat tissue, as these can affect the accuracy of the readings Alternative approved sites include the back of the upper arm and, for some systems, the upper buttocks. Before insertion, the area should be cleaned with alcohol and allowed to dry completely. It is crucial to follow the manufacturer's guidelines for sensor placement and to consider the individual's specific needs and circumstances to ensure optimal CGM performance and accuracy, as outlined in the standards of care in diabetes-2024 1.
From the Research
Optimal Location for Placing a Continuous Glucose Monitor Sensor
- The optimal location for placing a continuous glucose monitor sensor is not explicitly stated in the provided studies as the primary focus.
- However, a study 2 compared the accuracy of the Dexcom G4 Platinum continuous glucose monitor sensor inserted on the upper arm and the abdomen in adults with type 1 diabetes.
- The results showed that the accuracy of the sensor placed on the upper arm was not different from the accuracy of the sensor placed on the abdomen, with similar Mean Absolute Relative Difference (MARD) values and hypoglycemia sensitivity.
Considerations for Sensor Placement
- Other studies 3, 4, 5 discussed the benefits and challenges of continuous glucose monitoring, but did not specifically address the optimal location for sensor placement.
- A systematic review and meta-analysis 6 evaluated the effectiveness of continuous glucose monitoring in patients with type 2 diabetes, but did not investigate sensor placement locations.
Available Evidence
- The available evidence suggests that the abdomen and upper arm are both viable locations for placing a continuous glucose monitor sensor, with no significant difference in accuracy between the two sites 2.
- However, more research may be needed to determine the optimal location for sensor placement in different patient populations and to explore other potential factors that may influence sensor accuracy.