Abbott CELL-DYN 3200 System Operator's Manual page 150

Performance Characteristics and Specifications
Performance Characteristics
Truth Table
Table 4.17 Flagging Analysis Truth Table
Reference Normal
Reference Morphological
Positive
Reference Distributional
Positive
4-18
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
CELL-DYN 3200
CELL-DYN 3200
Normal
455 TN
1 FN
1 FN
Agreement =
False Positives =
False Negatives =
Specificity =
Sensitivity =
Table 4.18 shows the manual differential and CELL-DYN 3200 differential for
false negative results.
Table 4.18 Analysis of False Negative Results
Morphological False
Negative
Distributional False
Negative
CELL-DYN 3200
Morphological Distributional
Positive
15 FP
167 TP
49 TP
98.0%
3.19%
0.53%
96.81%
99.47%
Manual Differential
2.5% Immature grans
and 3.5 NRBCs
CELL-DYN 3500
WBC = 4.596
CELL-DYN
Section 4
Total
Positive
0 FP 470
13 TP 181
147 TP 197
CELL-DYN 3200
No flag generated
CELL-DYN 3200
WBC = 4.71
3200 System Operator's Manual
®
9140181K—July 2002