39
• Pipette or other transfer device (venous samples)
• Lint-free tissue (non-fraying)
Quality Control
The HemoCue WBC Analyzer has an internal qual-
ity control, the “self test”. Every time the analyzer is
turned on, it will automatically verify the measurement
performance. When passing the self test, the display
will show the HemoCue symbol and three flashing
dashes, indicating that the analyzer is ready to perform
a measurement. An error code will be displayed if the
self test fails. Another part of the built in self test (QC)
is performed for each measurement, including both
checks of the HemoCue WBC Analyzer but also several
condition checks of the HemoCue WBC Microcuvette and
the sample itself. The operator’s ability to handle the
microcuvette and apply the sample correctly is also in-
cluded in these self tests. No additional quality controls
performed by the operator are required for verifica-
tion of the system functionality. Follow local guidelines
regarding quality control procedures. If a quality control
test is to be performed, only use liquid controls recom-
mended by HemoCue, see relevant package insert for
more information.
Expected Values
(Dacie and Lewis Practical Haematology)
Adults 4.0–10.0 x10
9
/L
Children 1 year 6.0–16.0 x10
9
/L
Children 2–6 years 5.0–15.0 x10
9
/L
Children 6–12 years 5.0–13.0 x10
9
/L
Infants 1 month 5.0–19.0 x10
9
/L
Infants 2 months 5.0–15.0 x10
9
/L
Infants 3–6 months 6.0–18.0 x10
9
/L
The values above may vary due to a wide range of fac-
tors, such as sex, diurnal variations, exercise, physical
stress or trauma, pregnancy, indigestion of food, and
cigarette smoking.
Measuring Range
Displayed range: 0.3–30.0 x10
9
/L (300–30000/mm
3
,
300–30000/µL). Results above the measuring range will
be displayed as HHH. Results below the measuring range
will be displayed as LLL.
Limit of Detection
Functional Sensitivity is estimated as the mean concen-
tration for a spiked sample whose CV is 20 %. The Func-
tional Sensitivity has been determined to be 0.3 x10
9
/L
(James O. Westgaard, Basic Method Validation).
Limit of Blank is defined as the highest measurement
result that indicates that the analyte is not present in
the sample. Limit of Blank has been determined to be
0.06 x10
9
/L (CLSI Document EP17-A).
Limitations of the Method/Procedure
a) The measurement needs to be started no later than
1 minute after filling the microcuvette.
b) Do not remeasure the filled microcuvette.
c) Mixing samples for an extended period may affect
the result.
d) Results above the measuring range will be displayed
as HHH. Results below the measuring range will be
displayed as LLL.
e) Studies have shown that patient samples with >2 %
nucleated red blood cells (NRBCs) may give falsely
elevated white blood cell count.
Summary of Contents for WBC
Page 1: ...HemoCue WBC Operating Manual Manuel d utilisation ...
Page 2: ......
Page 4: ......
Page 6: ...HemoCue CleanerWBC 3 2 1 4 5 6 6 Components Éléments ...
Page 8: ...1 2 3 8 Start up Mise en service ...
Page 10: ...4 5 6 7 4 10 ...
Page 12: ...1 2 3 12 Set up Audio signal Configuration Signal sonore ...
Page 14: ...1 2 4 3 14 Measuring Capillary blood Mesure Sang capillaire ...
Page 16: ...5 7 6 8 16 ...
Page 18: ...10 9 11 18 ...
Page 20: ...12a 12b 13 14 15 20 ...
Page 24: ...1 2 3 24 Set up Printer function Configuration Mode impression ...
Page 26: ...1 2 3 4 5 26 Maintenance Daily Maintenance Entretien Entretien quotidien ...
Page 28: ...1 2a 2b 3 4 28 Maintenance Optical Parts Entretien Pièces optiques ...
Page 66: ...66 ...
Page 67: ...67 ...