Tools, Technologies and Training for Healthcare Laboratories

QC Selection Grid, Square 8

MULTIRULE CHOICE:

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You have few problems, but medically important errors are moderate in size, which means you should use at least three rules that can be applied to the two control measurements in a run (N=2) to improve error detection. You can also add a warning rule that works across two runs (R=2). The power curves below show the rejection characteristics within a run (R=1) and across two runs (R=2):

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Plot your critical-error on the x-axis of this power function graph. Draw a vertical line from that point to intersect the power curves. Where the curves and critical-error meet indicates how much error detection each control rule will provide.

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For over 25 years, WESTGARD QC has provided the latest news, education, and tools in the quality control field. Our goal is to bring tools, technology and training into today's healthcare industry — by featuring QC lessons, QC case studies and frequent essays from leaders in the quality control area. This is also a reference source for quality requirements, including CLIA requirements for analytical quality. This website features the best explanation of the Multirule ("Westgard Rules") and how to use them. For laboratory and healthcare professionals looking for educational and reference material in the quality control field.

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