QUALITY CONTROL
Sysmex SF-3000 Operator's Manual -- Revised September 1995 6-1
1. INTRODUCTION
Quality Control (QC) checks the accuracy of sample analysis data from day to day.
Specifically, QC consists of checking that the followings are satisfactory: (a) accuracy of
analysis results (i.e., whether the values obtained are correct) and (b) precision (i.e.,
reproducibility -- whether the same values are obtained when analysis is repeated on a
sample).
Two types of QC are used in the SF-3000: Individual QC, which is performed on
individual samples, and Statistical QC, which uses statistical methods.
• Individual QC : Refers to the function that monitors samples individually.
Aspects monitored include: blood aspiration sensor, reagent
sufficiency, electrical noise, and the plateau portions of cell size
distribution curves (histograms).
• Statistical QC : Refers to statistical calculations performed on sample analysis
and control blood analysis data. These calculations are carried
out by the QC Program.
• Statistical QC Program
The QC Program's main function is to provide highly reliable and accurate data by
running control blood material. However, to maintain the reliability of analyzed data,
constant monitoring by the operator of daily and hourly changes in analysis precision is
required.
Note that the QC program must be started after the instrument is correctly calibrated. If it
is not properly calibrated, monitoring of daily and hourly changes in system accuracy
will be pointless, no matter how thorough the QC program is carried out.
Calibration is carried out using the calibration programs. RBC and other blood cell
counts are controlled in the same way as in previous Sysmex models, by means of
checking the data values on control blood specified by Sysmex.
This chapter explains: QC charts, how to set X /L-J and X M monitoring, file deletion,
backup, and certain other items.
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