Expected Values; Performance Characteristics: Imprecision - Siemens ADVIA 2120 Operator's Manual

5. In certain abnormal specimens (specifically lymphoid disorders and
leukemias), erroneously elevated basophil counts may be observed.

Expected Values

The range of expected values can vary depending on age, sex, diet, and location.
It is recommended that each laboratory establish its own range of expected
values.
The following range of expected values is based upon the duplicate assay of 60
whole-blood specimens obtained from an adult population of assumed healthy
individuals.
Parameter
%NEUT
%LYMPH
%MONO
%EOS
%BASO
%LUC
NOTE:
except when %BASO is >5% and the Baso Count Suspect (B-SUSP, BC) flag is
triggered. In cases where the total is greater than 100% ± 0.2%, the amount in
excess of 100% is due to %BASO.

Performance Characteristics: Imprecision

A total of 18 runs were performed using multiple samples.
The following estimates of imprecision were obtained by taking 25 aspirations
from each whole-blood sample. Each of the sample selectivity modes was tested
by sampling from opened tubes and with the manual and automated closed-tube
samplers.
Parameter
%NEUT
%LYMPH
%MONO
%EOS
%BASO
%LUC
9-52
Low Value High Value
40
16
4
1
0
1
Because of numerical rounding, the Diff results should total 100% ± 0.2%,
Mean Standard
Deviation
55.0
31.3
7.2
3.4
0.5
2.5
77
44
9
7
1
4
CV (%)
0.9 1.6
0.9 2.9
0.5 6.9
0.3 8.8
0.1 20.0
0.4 16.0
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