Appendix – Quality control ABL90 FLEX reference manual
I-14
This rule is a rejection rule.
The difference between
two consecutive
measurements exceeds 4
SD.
This indicates inconsistency in your procedures or
an unstable analyzer.
Corrective action: Perform steps described in section
Quality control
evaluation further in this appendix.
This rule is applicable to both manual and built-in QC.
This rule is a rejection rule.
Four consecutive
measurements outside
the mean 1 SD on the
same side of the mean.
This indicates a trend or shift.
Corrective action: Perform steps described in section
Quality control
evaluation
further in this appendix.
This rule is only applicable to manual QC and is only recommended when
user-defined control ranges are established.
This rule is a rejection rule.
10 consecutive
measurements on the
same side of the mean.
This indicates a trend or shift.
Corrective action: Perform steps described in section
Quality control
evaluation further in this appendix.
This rule is only applicable to manual QC and is only recommended when
user-defined control ranges are established.
Rule R
4s
4
1s
Rule 10
x
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