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Quality Control
Accuracy and Precision Flags
Quality Control
UniCel DxC Systems Instructions For Use A13914
Page 6-2
October 2005
Accuracy and Precision Flags
The DxC utilizes the following Westgard rules for evaluation of QC data.
• 1-2S: Result Between ± 2SD and ± 3SD From the Assigned Mean
If the result is between ± 2 and ± 3 standard deviations from the assigned mean, the
result:
- is flagged as > 2SD on the QC Log report.
- appears in yellow on the QC LOG and QC CHART Screens.
- is highlighted in a pop-up note on the monitor as the system is running.
• 1-3SD: Result Greater Than 3SD From the Assigned Mean
If the result is greater than ± 3 SD from the assigned mean, the result:
- is flagged as > 3SD on the QC Log report.
- appears in red on the QC LOG and QC CHART Screens.
- is included in a real-time pop-up window as the system is running.
• 2-2S and R-4S: Results Between 2 SD and 3 SD as Compared to the Previous Result
In addition, the Z-score for the current result is compared with the Z-score of the
previous result in the same QC file. If both Z-scores are beyond 2 SD on the same
side of the assigned mean, the current result receives an "Accuracy" flag on the QC
Log report; this flag signifies a violation of the 2-2S rule. These values appear red
in the QC log and QC chart.
If the two results being compared are greater than 2 SD on opposite sides of the
assigned mean, the current result receives the "Precision" flag on the QC Log report,
signifying a violation of R-4S rule. These values appear red in the QC log and QC
chart.
Results Greater Than 4 SD From the Assigned Mean
Results greater than 4 SD are included in the QC Log and QC Chart, but are not used
to calculate statistics.
Flags Generated on Printed QC Reports
These flags appear in the remarks column of the QC results report:
• Greater than 2SD.
• Greater than 3SD.
• Two successive controls greater than 2SD (Accuracy).
• Two successive controls greater than 2SD on opposite sides of the assigned mean
(Precision).
• Mean and/or SD not assigned.