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The Westgard rules are a set of statistical patterns, each being unlikely to occur by random variability, thereby raising a suspicion of faulty accuracy or precision of the measurement system. They are used for laboratory quality control , in "runs" consisting of measurements of multiple samples.
[39] [40] [41] While CLIA does specify minimum retention requirements, it does not specify a federal maximum retention period. Retention periods for NBS cards vary by state with several states storing the cards long-term such as New Jersey with 23 years, or Texas which may keep the cards indefinitely.
Westgard rules are commonly used to analyse data in Shewhart control charts. Westgard rules are used to define specific performance limits for a particular assay (test) and can be used to detect both random and systematic errors. Westgard rules are programmed into automated analyzers to determine when an analytical run should be rejected. These ...
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CLIA may refer to: Chemiluminescent immunoassay; Clinical Laboratory Improvement Amendments; Cruise Lines International Association This page was last edited on 20 ...
The Western Electric rules are decision rules in statistical process control for detecting out-of-control or non-random conditions on control charts. [1] Locations of the observations relative to the control chart control limits (typically at ±3 standard deviations) and centerline indicate whether the process in question should be investigated for assignable causes.