The TBS is software that is used in the same machine as the DEXA test. They dud both at the same time. If you had a scan less than 2 years ago if the doctor writes "medically necessary" insurance should cover the DEXA scan. The TBS was an additional $50 to me, our if pocket. If your doc diesnt know the huge benefits of a TBS or Echolight scan I'd find a better doctor.