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« Error Rates in a Vet Laboratory | Main | The latest news in Traceability »

June 01, 2013


Hassane Bayt

Hassan Bayat; DCLS; Sina Lab
June, 05,2013

Based on thoughts from two Westgards’, when a look-back rule is broken, e. g. a between-run 4:1s rule, it means that a systematic error has happened since 4 runs before and has continued until now. If such a systematic error makes the last run out-of-control, then the previous 3 runs have to be judged as out-of-control, too; and we SHOULDN’T have released those previous 3 runs!
Therefore, I think we’d better to call across-runs rules “WAIT UP” rules and treat them in such a way. Meaning, when we are using a look-back rule, and confront with the first point violating the limit, we have to suspend reporting that run until the QC results from coming runs are compiled and we are able to decide whether a look-back rule is broken or not.
Suppose we are using a multi-rule SQC containing 41s rule. If C2 result in run 12 is 1.3s, we have to suspend reporting 12th run and wait for coming QC results; i.e. our decision must be “WAIT UP!” Then after performing coming runs, we could be able to decide to accept or to reject 12th run. If:
- 13rd run: C2 > 1.5s; Decision: Still Wait, ALSO HOLD “13rd run”!
- 14th run: C2 < -1.6s; Decision: 41s rule isn’t broken for 12th and 13rd runs; report that runs, But hold 14th run for coming runs!
What if we have to hurry?
We have two options:
1) When our QC is out of look-back limit, we have to perform next run(s) immediately, even just running the control(s), to reach somewhere that we are able to judge about the first violated run. Of course, such an approach could be laborious and expensive.
2) An alternative solution could be having some kind of Multi-design SQC based on the statuses we use SQC for:
- One design for routine status, using look-back rules; and
- One design for STAT status, without look-back rules.
For example:
- “13s/22s/R4s/41s; N=2; R=2” for routine application, and
- “13s/22s/R4s/41s; N=4; R=1” for STAT application.
Maybe after “Multi-level SQC” and “Multi-stage SQC”, the mentioned approach could be 3rd kind of multi-design SQC, and could be called “Multi-status” design.

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