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Operator's Guide
437D140 Rev. I
Scanning AP Spine
7-23
Definitions of Scan Results
T-SCORE
The T-score is the number of standard deviations a patient’s BMD value is above or
below a young reference value for individuals of same ethnic background and sex.
% YOUNG
REFERENCE
The % Young reference value is the ratio of the patient’s bone mass to the young ref-
erence value for individuals of same ethnic background and sex.
Z-SCORE
The Z-score is the number of standard deviations that the patient's BMD value is
above or below the reference value for individuals of same age, ethnic background
and sex.
% AGE-MATCHED
The % Age-matched value is the ratio of the patient's bone mass to the reference
bone mass value of individuals of the same age, ethnic background and sex.
% ST: SHORT TERM
CHANGE
Ratio of change between current scan and most recent previous scan.
% LT: LONG TERM
CHANGE
Ratio of change between current scan and patient’s initial scan.
%/YR value
Indicates the percent of ST or LT change calculated per year.
Table 7-4:
Definition of Scan Results
Fracture Risk Assessment
The patient's risk of fracture is plotted in the Reference Charts displayed in the Scan Results tab window. Nor-
land incorporates the WHO (World Health Organization) criteria in plotting a patient's fracture risk assessment.
See table below. (Note that this table is re-reprinted here for reference.)
Low Risk
(Green)
Represents the range of values determined by WHO to be 'nor-
mal' (having adequate bone mineral). The BMD T-Score values
in this region are within 1 SD of the young adult reference mean
value. A patient whose value is plotted in this region has no
identifiable risk of fracture.
Medium Risk
(Yellow)
Represents the range of values determined by WHO to be
'osteopenic' (having low bone mineral). The BMD T-Score val-
ues in this region range are more than 1 SD below the young
adult mean value but less than 2.5 SD below the mean value. A
patient whose value is plotted in this region may be developing
a tendency to fracture.
High Risk
(Red)
Represents the range of values determined by WHO to be
'osteoporotic' (having severely reduced bone mineral). The
BMD T-Score values in this region are more than 2.5 SD below
the young adult mean. A patient whose value is plotted in this
region has a high spontaneous fracture probability.
Table 7-5:
WHO Criteria: Fracture Risk Assessment
Summary of Contents for Elite 437A150
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Page 66: ...11 Click Operator s Guide 437D140 Rev I 3 10 Installation and Setup...
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