@roseincalifornia It is important to get the same machine, same technician, etc. but not always practical. Technicians quit, machines get replaced, patients move. My doc said it is preferrable but not required. I would like my next DEXA to be at a facility where we can add TBS; there are quite a few in my area but the one my doctor sends me to does not have that capability. So no TBS for me if I "have to" go to the same machine/facility.