Don’t calibrate right before or after exercise. For me, my blood sugar usually is on the move during the first bit of a workout and immediately after it. Plus, the chance of BG swings is greater while exercising, which is bad news for calibration.
Treat the number after finding a “Lost Sensor” with some skepticism. I find I often need to recalibrate 30-60 minutes after reacquiring the sensor.
