DXA Precision and Accuracy Comparison Study

For this study, two specific groups of volunteers will be recruited. In one group, the scan
will measure bone density and in the other group the scan will measure fat. The groups will
be broken into weight groups to determine which of the scanners the subject will be scanned
on. Subjects will have the option to participate in either one or both groups.

Inclusion Criteria:

1. Men and women > 20 years old

2. Willing to provide consent

3. Falls into one of three weight categories, with minimum 30 subjects per category.

- Less than 200 lbs.

- 200 (inclusive) to less than 350 lbs.

- 350 (inclusive) to less than 450 lbs.

4. Participate in only one weight category in either skeletal or body composition
cohort, or both.

Exclusion Criteria:

1. Inability to remain still for the duration of the DXA scans as judged by study
Investigator.

2. Un-removable internal / external scan artifacts e.g. plaster casts, metal rodding
naso-gastric tubes, etc.

3. Females of childbearing potential* with actual (confirmed by positive urine pregnancy
test) or suspected (based on study Investigator evaluation despite a negative urine
test) pregnancy.

4. Subject had already given consent to participate in any aspect of this study.