There may be a better thread than this one, but ...

I just compared my readings with the Abbott Precision glucometer, the built-in Freestyle Libre glucometer and the Libre CGM -- non-fasting, 5:00 pm. The readings were 85, 77, and 58(!) in American units.

My CGM readings have been consistently low this past week - 20 to 30 points lower than what the blood tests show. I don't know if I want to pay for more sensors if the readings are so far off.

N.B. The variation in CGM readings looks legit. My readings are mostly constant with variations for exercise and, of course, meals. Just the absolute reading is off.

Also, do the sensors go out of date? The current sensor is about 2 years old. I threw away the box, so I don't know if it says.

Any suggestions?

Thanks.