4-18
CELL-DYN
®
3200 System Operator’s Manual
9140181K—July 2002
Performance Characteristics and Specifications
Performance Characteristics
Section 4
Truth Table
The Truth Table, showing sensitivity and specificity and the analysis of the false
negative results, is presented in this section. For the distributional analysis,
absolute limits were used. The data is based on the evaluation of a total of 848
cases.
In Table 4.17:
TP = True Positive
TN = True Negative
FP = False Positive
FN = False Negative
Agreement = 98.0%
False Positives = 3.19%
False Negatives = 0.53%
Specificity = 96.81%
Sensitivity = 99.47%
Table 4.18 shows the manual differential and CELL-DYN 3200 differential for
false negative results.
Table 4.17 Flagging Analysis Truth Table
CELL-DYN 3200
Normal
CELL-DYN 3200
Morphological
Positive
CELL-DYN 3200
Distributional
Positive
Total
Reference Normal 455 TN 15 FP 0 FP 470
Reference Morphological
Positive
1 FN 167 TP 13 TP 181
Reference Distributional
Positive
1 FN 49 TP 147 TP 197
Table 4.18 Analysis of False Negative Results
Manual Differential CELL-DYN 3200
Morphological False
Negative
2.5% Immature grans
and 3.5 NRBCs
No flag generated
CELL-DYN 3500 CELL-DYN 3200
Distributional False
Negative
WBC = 4.596 WBC = 4.71
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