![]() ![]() ![]() This control rule terminology has now become fairly standard in healthcare laboratories. We introduced abbreviations of the form 1 3s to identify individual decision criteria or 'control rules.' Multirule criteria were indicated by putting a 'slash' between different control rules, e.g., 1 3s/2 2s/R 4s/4 1s/10 x. Remember that two different QC materials are required according to USA CLIA regulations, thus this lesson is particularly relevant for QC applications in the USA.Ĭontrol rule terminology When we surveyed the industrial quality control literature to identify recommendations for interpreting control results and to study their sensitivity for detecting different kinds of analytical errors, we needed some shorthand notation to identify the many recommendations. The purpose of this lesson is to illustrate how to interpret results for a multirule QC procedure when two different control materials are being analyzed. An earlier lesson on Levey-Jennings control charts provided some examples of how to interpret control results when using 2s or 3s control limits. This may be simple for experienced analysts who can often look at a pattern of control results and quickly come to a valid decision, but new analysts need guidance on what to look for in the control data if the laboratory is to maintain a consistent level of quality. One of our objectives in describing 'A multirule Shewhart chart for quality control in clinical chemistry' was to standardize the interpretation of control results.Įveryone in the laboratory needs to be able to make the same judgment on whether or not to report patient test results. ![]() PLEASE NOTE: An updated version of this lesson is now available in.See how the multirule QC should be done (and find out if you've been doing it right yourself). Westgard walks you through a Levey-Jennings chart day by day, plotting the control data and pointing out which run violates which rule. How do you use them? This lesson combines basic QC theory and practice to show you how. Quality of test results meets the defined clinical needs. Clinical labs have used the Westgard Rules for years, and labs routinely. Are there other multirule QC procedures beside this 'Westgard rules' combination? Remember that multirule QC is a concept and that the 'Westgard rules' combination illustrated here is just an example of how that concept can be applied. ![]()
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