QUALITY CONTROL
Sysmex SF-3000 Operator's Manual -- Revised September 1995 6-53
12. CONTROL CHART DEFINITION
In the SF-3000, the Levy-Jennings Method is used as a basic principle for reading the
QC Charts. This method consists of the following operation: If the latest control data
point is outside the control limits, the last 20 (including the latest) data points are
searched for a point that is outside the same limit as the latest data point. If such a point
is found, the data is judged to be abnormal. If no such point is found, X /L-J control is
repeated, and if the result of the repeat control is inside the control limits, the quality
control is not judged abnormal. Naturally, if the repeat control result is outside the same
limit as the previous result, the quality control is judged abnormal.
• How abnormality is displayed
If the quality control is judged abnormal, the relevant parameter name appears backlit.
Example displays: Abnormality judged
20 data points
Latest data
WBC
Figure 6-48: Quality Control Error Display
Example displays: No abnormality judged
20 data points
Latest data
WBC
Figure 6-49: Quality Control No-Error Display
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