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Hologic Conversion Tables

For accurate comparison of bone density results, it's best to be retested on the same densitometer. However, this is not always possible because test centers may go out of business or replace an old densitometer with a new one; or patients may move out of town. If you switch from a GE or Norland densitometer to a Hologic densitometer, you can use the following conversion tables to make your DXA results more meaningful because the BMD numeric results will be different on machines by different manufacturers. 

    The T-scores, however, should be equivalent, except for the those of the femoral neck. Hologic measures the femoral neck at a point closer to the trochanter than GE, and as a result Hologic femoral neck T-scores may be slightly higher than those of GE. Keep in mind that slight differences in measurements may occur even on the same machine, but the newer machines are becoming more and more consistent with their results.

    The information below will help you determine if your bone densities went up, down, or stayed the same between tests. The formula for calculating % changes is:

(BMD of current test - BMD of previous test) BMD of previous test.

The information below is courtesy of Hologic

 Converting Lunar and Norland

BMD results to Hologic Equivalent units

 Table 1.  Lunar DXA Systems

Measurement Site

Conversion Equation

Reference

Lumbar Spine

Hologic BMD= 0.918 x Lunar BMD 0.038

1

Total Hip

Hologic BMD= 0.971 x Lunar BMD 0.037

2

Femoral Neck

Hologic BMD= 0.8638 x Lunar BMD 0.039

2

Trochanter

Hologic BMD= 0.8588 x Lunar BMD 0.023

2

 Table 2.  Norland DXA Systems

Measurement Site

Conversion Equation

Reference

Lumbar Spine

Hologic BMD= 0.924 x Norland BMD + 0.077

1

Total Hip

Hologic BMD= 1.004 x Norland BMD + 0.020

2

Femoral Neck

Hologic BMD= 0.906 x Norland BMD 0.012

2

Trochanter

Hologic BMD= 0.8697 x Lunar BMD + 0.067

2

For more information about Hologic densitometers, contact Hologic at 

Hologic Inc.

35 Crosby Drive

Bedford, MA 01730

Tel 781.999.7300

www.hologic.com

The conversion equation from Lunar Total Hip BMD to Hologic Total Hip BMD

Prepared by:

Thomas L. Kelly

Principal Scientist

Hologic, Inc.

February 12, 2007

Hologic DXA Bone Density Reports

GE DXA Bone Density Report

Mindways QTC Bone Density Report

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