Bone Density Data from DPA to DXA and Manufacturer to Manufacturer

  • Sydney Lou Bonnick
Part of the Current Clinical Practice book series (CCP)


The extraordinary advances in bone-density technology over the past 30 years, enhancing the physician’s ability to detect and manage metabolic bone disease, have also created a dilemma as physicians have attempted to compare results obtained on early dual-photon devices with today’s dual-energy X-ray devices. As dual-energy X-ray technology has advanced, data from pencil-beam systems is now being compared with data from fan-array systems. Data from one manufacturer’s pencil-beam DXA device may need to be compared to data from another manufacturer’ s pencil-beam device. This situation is not dissimilar to circumstances created during the evolution of other types of quantitative measurement techniques used in clinical medicine. For example, the measurement of some parameter in blood may have initially been performed using one type of assay, only to be later replaced by a different assay. There may be different ranges of normal, depending on the assay, and even depending on the laboratory. Although it would be ideal for a patient being followed with a quantitative measurement technique for any reason to return year after year to the same laboratory to be tested using the same assay, this is not a reasonable expectation. In the context of bone densitometry, it is useful to have some ability to compare measurements originally made with DPA to measurements being made with DXA. In addition, the differences between the values obtained on different manufacturers’ DXA devices, with their respective reference ranges, must be appreciated.


Femoral Neck Proximal Femur Bone Densitometry Bone Density Data Quantitative Measurement Technique 
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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • Sydney Lou Bonnick
    • 1
  1. 1.Texas Woman’s UniversityDentonUSA

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