Dexcom G7 Sensor Replacement Frequency
The Dexcom G7 sensor must be replaced every 10 days, as this is the FDA-approved wear duration for this device. 1, 2
Standard Replacement Schedule
Replace the Dexcom G7 sensor every 10 days without exception. This is the manufacturer-specified and FDA-approved wear period for the G7 system. 1, 3
Do not extend sensor wear beyond 10 days, as accuracy deteriorates significantly after the approved wear period, and the device is not validated for longer use. 1, 2
The G7 maintains excellent accuracy throughout its 10-day wear period, with an overall mean absolute relative difference (MARD) of 8.2% for arm placement and 9.1% for abdomen placement. 3
Best Practices for Sensor Changes
Insert the new sensor before removing the old one to avoid gaps in continuous glucose monitoring data collection. This ensures uninterrupted monitoring and optimal diabetes management. 1, 2
Patients should have uninterrupted access to their supplies to minimize gaps in CGM coverage, as continuous use is essential for maximal benefit. 4, 1
The G7 is factory-calibrated and does not require fingerstick calibrations for treatment decisions, simplifying the user experience compared to older CGM systems. 1, 2
Real-World Considerations
In real-world use among youth with type 1 diabetes, the median sensor wear time is only 8.6 days, with just 39.9% of sensors worn for the full 10 days. 5
This shorter real-world wear duration means patients may require approximately 43 sensors per year rather than the standard 36 sensors to maintain continuous coverage. 5
Nearly 25% of sensors are removed before 7 days in clinical practice, highlighting the importance of adequate sensor supply and troubleshooting skin reactions or other issues that lead to early removal. 5
Common Pitfalls to Avoid
Never attempt to extend G7 sensor wear beyond 10 days, even if the sensor appears to be functioning well, as accuracy is not validated beyond this period and readings become unreliable. 1, 2
Address skin reactions promptly (irritation or allergy at the insertion site) to prevent premature sensor removal and maintain continuous monitoring. 4, 1
Ensure patients understand the importance of timely sensor changes for maintaining accuracy and reliability of glucose readings, as delayed replacement compromises diabetes management. 1
Special Populations
In pregnant women with diabetes, the G7 maintains excellent accuracy (92.3% agreement rate in the 63-140 mg/dL range) throughout the full 10-day wear period, with a 90.3% sensor survival rate. 6
For hemodialysis patients, use the G7 with caution and focus on glucose patterns rather than individual values, though the 10-day replacement schedule remains unchanged. 2