Quality Control
Additional QC Precision Rules
UniCel DxC Systems Instructions For Use A13914 Quality Control
October 2005 Page 6-3
6
Additional QC Precision Rules
Some additional Westgard QC rules are helpful when determining whether the system
is in control. These are not flagged by the DxC QC package but can help in
determining system performance. (Refer to Figure 6.1.)
• 4-1S Within or Across: Last Four Results of One or Two Levels of Control
Were More than 1 SD From the Mean on the Same Side
This rule judges the result out-of-control if the last four results from one or two
levels were more than 1 SD from the mean in the same direction.
• 10X Within or Across: Last Ten Results of One or Two Levels of Control Were
All on the Same Side of the Mean
This rule judges the result out-of-control if the last ten results from one or two levels
were all on the same side of the mean.
Figure 6.1 QC Accept/Reject Chart Using Westgard Rules
When defining controls, Control IDs should be as descriptive as possible. Refer to the
UniCel DxC Synchron Clinical Systems Reference Manual for further details. The
following procedures describe how to run control samples.
E015001L.EPS
ACCEPT/REJECT CHART
IN CONTROL ACCEPT RUN
Control
Data
2S
3S 2S 4S 1S X
1
12R410
YESYES
YES
NO
NO
NO
NO NO NO
YES YES YES
OUT - OF - CONTROL REJECT RUN EVALUATE
To Next Page
Loading...
Need help?
General
