If you have a meter that saves your readings, or even if you don't, and you test someone else with the same meter, it can drastically change your next reading and give you a false reading. You should test more than once if you feel this is the case. You may think your sugar has dropped, and that it is in a good range, and if that is the case it could be harmful. Also, you may think it is too high and adjust your sugar, and that too can be harmful. Either way, the simple answer is Just Don't Share Your Meter.
Next Discussion: Techicians; How hard would it be to restructure page? »