Thank you for the clarification. Yes, I will restate it and try to remember to word it correctly in the future. Both the PDM and the CGM show that they are within control parameters. Both give very different numbers. I do understand that the CGM is calibrated to a meter, of course, but which one do I trust? My son was very astute and said to use the PDM (which reads low) because if it is actually higher (the Nano reading) and we trust that, but he is in fact much lower, it would make him go very low. However, we've always used Nano without experiencing many low symptoms. If, however, the Nano is correct, then using the PDM readings will mean thinking we have numbers in range (80 to 120) when in fact the number could be much higher (160s). This would, over time, affect A1C. I have to call Omnipod today anyway about strips, so I'll ask them what they think.