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Sensor can be flaky due to nearing time to change
The sensor is dead and needs to be changed
The Dexcom G6 and G7 sensors can be worn for up to 10 days, with the G7 also having a 12-hour grace period at the end.
Bad sensor placement
Placed in a part of the body that doesn’t have enough fat - think a scrawny kid or frail elderly personeasily possible on an underweight patient. More common on younger and older patients.
Adhesive failure. People who are active, get sweaty, swim, etc. may have problems with the adhesive on the sensor breaking down sooner than the expected timeframe (the sensor is good for 10 days so the adhesive needs to last that long). When the sensor doesn’t have solid contact there is a potential to get flakey results, no data, bad readings, etc…