![]() The recommended consequences when any of the above patterns occur is to reject the run, except for the rule of 1 2s (top in table), which serves as a warning and a recommendation of careful inspection of the data. In the original Westgard multirule QC procedure, this rule is used as a warning rule to trigger careful inspection of the control data by the following rejection rules. 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).Ĥ consecutive measurements exceed 1 standard deviation on the same side of the mean.ġ0 consecutive measurements are on the same side of the mean. refers to the control rule that is commonly used with a Levey-Jennings chart when the control limits are set as the mean plus/minus 2s. One measurement exceeds 3 standard deviations either above or below the mean of the reference range.Ģ consecutive measurements exceed 2 standard deviations of the reference range, and on the same side of the mean. One measurement exceeds 2 standard deviations either above or below the mean of the reference range. They are plotted on Levey–Jennings charts, wherein the X-axis shows each individual sample, and the Y-axis shows how much each one differs from the mean in terms of standard deviation (SD). They are a set of modified Western Electric rules, developed by James Westgard and provided in his books and seminars on quality control. They are used for laboratory quality control, in "runs" consisting of measurements of multiple samples. 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. ![]()
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