Siemens ADVIA 2120, Operator'S Manual, Page: 382 / 477

Regulatory Information 9-41
Parameter
Expected
Value
MN (cells/
μ
L)
0-10
PMN (cells/
μ
L)
0-4
Performance Characteristics: Precision
Within run precision on the ADVIA 120 CSF Assay was evaluated by
performing replicate aspirations of 16 CSF patient samples with adequate
volume. Volume permitting, CSF samples were aspirated 2–10 times. Results
from the 16 samples were pooled giving a total sample size of n=65.
Precision of CSF WBC Counts (n=65)
Parameter Mean SD CV
WBC 44.6 5.0 11.2
Precision of CSF RBC Counts (n=65)
Parameter Mean SD CV
RBC 12.9 4.1 31.7
Precision of CSF WBC Differential (n=65)
Parameter Mean SD CV
% Neut 12.5 3.2 25.5
% Lymph 74.9 5.1 6.9
% Mono 8.3 3.2 39.3
% MN 83.2 3.6 4.3
% PMN 16.8 3.6 21.2
# Neut 4.8 1.1 23.6
# Lymph 33.8 4.0 11.7
# Mono 4.1 1.2 30.1
# MN 37.9 4.7 12.4
# PMN 6.6 2.0 29.9