Yes, maddening but I think I learned (read so much it is getting hard to attribute from where!) that despite there being variation between DEXA readings on different machines there is not wild variation. Otherwise, all the readings would really be useless!

So if you have severe osteoporosis you will still fall in the osteoporosis, or severe osteoporosis, range ....seems there may be a slight concern for recommended treatment (or none) for those persons with low-level osteoporosis, or osteopenia. These people might be over-treated by pharma. But I doubt those of us who have severe op would be over-treated; if we accept treatment regardless of variations in the DEXA scores across machines even if we only have moderate op, we could become low op or hit the osteopenia range.

Key is when you relocate to try to find a provider/location that has the same DEXA machine used in your past...then you will have a clearer picture whether you improved, or backslide, due to the brands specific calibrations.