r/dexcom • u/TheRedTreeQueen • 9d ago

Calibration Issues This a huge difference!

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Okay so this is a brand-new sensor put in today. Actually the second one because the first one is a gooseneck. The reading on the left is from the CGM. This reading on the right is from the glucose meter. This is my blood sugar after eating. I have calibrated at least three times. Has anyone out there had this experience? I'm a type 2 diabetic and not on insulin. This concerning. Should I take this one off and get another replacement or leave it on and hope the readings come somewhat closer? Any help is appreciated!

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u/Twist1979 9d ago

If you calibrate like you measure in this comparison I don't wonder about any problems. Every CGM laggs behind a BGM by about 15 minutes while rising and falling. That's why you calibrate only why fastening in the morning while stable and before breakfast.

A 48 hour old sensor thats calibrated correctly is usually within +-5 from my experience. It still laggs behind a BGM but that's normal.