QBC STAR System Operator’s Manual
6000-300-000 5–4
Two QBC STAR tubes were prepared on each of approximately 323 blood samples and analyzed on both the QBC STAR
system and either the Coulter
®
STKS or Sysmex K1000 analyzers*. The correlation coefficients for the WBC, Gran, L/M,
Hct, and Hgb, and Plt parameters were 0.95 or greater. Complete statistical results are presented on following page.
Parameter
Correlation
Coefcient
Slope Intercept
QBC
Mean
Cell
Counter
Mean
Range of
Values
Number
of
Samples
Hematocrit (%) 0.983 0.973 2.572 36.5 34.8 15.7 – 61.7 646
Hemoglobin (g/dL) 0.984 0.982 0.387 12.1 12.0 5.2 – 18.5 638
Platelet (x 10
9
/L) 0.962 0.935 17.701 244 242 23 – 913 558
WBC (x 10
9
/L) 0.974 1.124 –0.936 10.4 10.1 1.6 – 92.9 535
Granulocyte (x 0
9
/L) 0.972 0.991 0.152 7.0 7.0 0.8 – 45.0 535
Lymph/Mono (x10
9
/L) 0.987 1.206 –0.419 3.3 3.1 0.8 – 89.9 535
The hematocrit results shown above reflect the calibration methods of the Coulter or Sysmex analyz-
ers used in the correlation study. The QBC STAR software has been calibrated to match the interna-
tional reference standard for microhematocrit (MHCT) technology. The data shown in the table below
was obtained by comparing the QBC STAR results against the microhematocrit reference method.
12
Interfering Substances
• Hemolysis: Do not perform tests on visibly hemolyzed blood specimens.
• Bilirubin: No effects on test results have been observed at bilirubin concentrations up to 20
mg/dL.
8
• Triglycerides: No effects on test results have been observed at triglyceride concentrations up
to 1,800 mg/dL.
8
• Coumadin: Anticoagulant therapy has been shown to have no clinically significant effect on
performance.
8
• Doxorubicin: Treatment with the anthracyclic drug Doxorubicin does not appear to interfere
with the QBC test method.
8
• Other Drugs: The effects of other potentially interfering drugs and their metabolites on QBC
tests have not been established.
9, 10
* Products of Coulter Electronics, Hialeah, FL and TOA Medical Electronics, Kyoto, Japan.
Parameter
Correlation
Coefcient
Slope Intercept
QBC
Mean
Cell
Counter
Mean
Range of
Values
Number of
Samples
Microhematocrit (%) 0.986 1.023 –0.650 36.5 36.3 15.7 – 61.9 646
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