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Two measurements in the same run have a 4 standard deviation difference (such as one exceeding 2 standard deviations above the mean, and another exceeding 2 standard deviations below the mean).
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are a set of statistical patterns, each being unlikely to occur by random variability, thereby raising a suspicion of faulty
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2 consecutive measurements exceed 2 standard deviations of the reference range, and on the same side of the mean.
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The recommended consequences when any of the above patterns occur is to reject the run, except for the rule of 1
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216:(top in table), which serves as a warning and a recommendation of careful inspection of the data.
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Ofer Harel; Enrique F. Schisterman; Albert Vexler & Marcus D. Ruopp (July 2008).
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4 consecutive measurements exceed 1 standard deviation on the same side of the mean.
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and provided in his books and seminars on quality control. They are plotted on
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10 consecutive measurements are on the same side of the mean.
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either above or below the mean of the reference range.
252:"Monitoring Quality Control: Can We Get Better Data?"
27:of the measurement system. They are used for
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81:either above or below the mean of the
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308:SMILE, Johns Hopkins University
136:Inaccuracy and/or imprecision
115:Inaccuracy and/or imprecision
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304:"Westgard Rules - Guidelines"
89:Inaccuracy and/or imprecision
268:10.1097/ede.0b013e318176bfb2
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108:One measurement exceeds 3
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29:laboratory quality control
312:Review date: 1 April 2020
226:Western Electric rules
33:Western Electric rules
51:(SD). The rules are:
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16:Statistical patterns
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57:Rule
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