QUALITY CONTROL
Sysmex SF-3000 Operator's Manual -- Revised September 1995 6-47
10. QC METHODS AND APPLICATIONS
Quality Control in the SF-3000 features the commercial control applications X Control
or L-J Control, and also X M Control, which uses routine patient samples.
10.1 X Control
X Control corresponds to the X -R Control used in earlier models. The "R"
(=difference) has been dropped because the reproducibility of the instrument has
improved and the use of R is decreasing. Another reason is that daily monitoring is now
increasingly favored as a cost-saving method. Because the control blood is synthetic,
changes in the reagent may not produce the same changes in the control blood as in
human blood. The control blood can be used for a long period of time before it reaches
its expiration date, and values are displayed as reference values.
X Control uses control blood to perform daily monitoring of the instrument. It
analyzes the control blood twice in succession, and takes the average of the two analyses
as the control data point. Because the control data is an average value, it is hardly
affected by the reproducibility.
10.2 L-J Control
Like X Control, L-J also uses control blood to perform daily monitoring of the
instrument. It uses the results of a single analysis of the control blood as the control data
point.
The range of control blood controlled by L-J Control is broader than the range controlled
by X Control. Consequently, L-J Control is more liable to be affected by
reproducibility.
If the instrument has a sampler, L-J control can be executed using the Auto mode
analysis. QC bar codes are attached to the QC blood tubes, and when Auto mode
analysis is performed, the results of the control blood are stored in the L-J file whose
number is identified by the bar code. By using the auto mode analysis, L-J Control can
perform hourly monitoring in addition to daily monitoring.
In the QC program, either X or L-J Control can be selected in the "System Settings"
program.
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