Dexcom G7 Sensor Replacement

Continuous glucose monitoring (CGM) systems, such as Dexcom or Freestyle Libre CGM sensors, assist people with diabetes and let them monitor their blood sugar levels in real time. These CGM systems consist of a small CGM sensor that detects glucose levels from interstitial blood through its micro-needle and transmits this data to either a receiver or a compatible mobile phone. Each sensor lasts for a specific time span, e.g., 10 days, 14 days, or 15 days. Dexcom sensors usually last for up to 10 days; thus, correct Dexcom sensor replacement holds significant importance. Here, we have specifically discussed Dexcom G7 Sensor Replacement and basic troubleshooting.

How Often Should I Replace My Dexcom Sensor?

The frequency of Dexcom sensor replacement depends on the Dexcom model:

• Dexcom G6 Sensor is designed to last as long as 10 days of continuous usage.
• Dexcom G7 Sensor It has a wear duration of up to 10 days, with a grace period of 12 hours after the sensor expiration. You’ll get alerts telling you when exactly your grace period will expire. You can either end the sensor early or wait till it ends automatically.

Removing the sensor within the recommended interval will ensure the highest performance and the most precise glucose readings. Not replacing it on time can result in incorrect readings and gaps in data.

How to Replace OR Stop Dexcom G7 Sensor

Stopping and/or replacing the Dexcom sensor is a simple procedure. Dexcom G7 sensor replacement time comes with alerts; your sensor has completed its lifespan or is in the grace period. When in the grace period, you have the option to either stop the sensor early and insert a new CGM sensor, stop it only, or let it complete the 12 grace hours. Once the sensor expires, you will receive an alert to apply a new sensor. The following are the steps to remove the old and insert a new G7 sensor:

Stopping the Sensor:

If you want to stop the sensor only and are not ready to replace the sensor right away, simply stop the sensor session by opening the Dexcom app and selecting “Stop Sensor.” Once the sensor is stopped, you can peel it off.

• Peeling off the old sensor: Gently peel off the patch of adhesive. If necessary, you can use an adhesive remover to facilitate removal.

Applying a new G7 Sensor:

To start your new sensor, grab a new applicator and enter a sensor ID by using the camera to scan the code. Now, insert the new sensor:

• Clean the back of your upper arm with an alcohol wipe. Let the skin dry completely.
• Unscrew the cap. Press and hold the applicator against the skin and push the button.
• Your sensor has been applied.
• Wait for your sensor to pair. Tap ‘OK’ on your pairing complete screen and let the sensor warm up.

Keep your phone within 20 feet during the sensor warm-up. You can review the in-app instructions if needed. Once the sensor is applied, you can apply a CGM patch over it for added safety of your sensor.

If removing a Dexcom G6 CGM

Disconnect the Transmitter (If reuseable) by clicking the latch until it is released and then carefully remove the transmitter. This is because in Dexcom G6, the transmitter is externally attached to the sensor, unlike the Dexcom G7, which has the transmitter installed within the sensor.

Dexcom Sensor Failure: Causes and Troubleshooting

Sometimes, users might suffer sensor failures, which can lead to inaccurate readings or even an entire shutdown. The most common causes are:

• Introduction Errors: When the sensor isn’t properly installed, it may give inaccurate readings or no readings at all.
• Adhesive Problems: Sensors that are loose could not remain in position, causing data irregularities.
• Calibration Errors: While Dexcom G7 (as well as G6) does not require calibration by hand, inaccurate readings could occur if the sensor is defective.
• Interferences From Medications: According to a study shared by PubMed, “Acetaminophen (paracetamol) interferes with continuous glucose monitor (CGM) sensing, resulting in falsely elevated CGM glucose values.”
• Sensor Expiration: If you use a sensor after the expiration date, it could result in failure.

Troubleshooting Tips:

• Try restarting your device to determine if the issue is resolved.
• Verify that the sensor is placed correctly and is fully attached to the skin. You may use a CGM patch or a CGM sticker to keep your CGM sensor intact and firmly attached to your skin.
• If you continue to experience issues, call Dexcom Customer Service for assistance in troubleshooting or a replacement sensor.

In the case of Dexcom G6, check the battery life of your transmitter as well.

Conclusion

Unlike predecessors, the Dexcom G7 does not just expire, instead, it provides you 12 grace hours after your sensor life is completed. You start getting alerts when your CGM sensor lifespan is completed or you’re in a grace period. The G7 has a much lower warm-up time of 30 minutes and has a transmitter installed within the sensor. To keep CGM sensors firmly in place, many find it useful to apply CGM patches over the sensors. These sensors are breathable, waterproof, and provide enough stretch to support your active lifestyle.