Tools, Technologies and Training for Healthcare Laboratories
Westgard Rules and Levey-Jennings Charts

Westgard Rules and Levey-Jennings Charts

  • Teacher: James O. Westgard, Ph.D.
  • Released: 2022-04-18 14:39:01
  • Level: Beginner

Finish all lessons and pass quizzes with an average of 70%


After registering or logging in, you can Enroll in this Course by clicking here. [Please note: the course takes a separate username and password than you use at]

You can also enroll through the online store at, where coupon discounts may be available (but access may require additional days for processing).

The "Westgard Rules" and Levey-Jennings short course is an online training program intended for professionals in Clinical Laboratory Science (CLS).

This course includes lessons, worksheets, and online graphing tools.

Participants must pass a final exam to receive continuing education credits for this course. The internet materials are being provided here on this website and on the main website of Westgard QC.


This course is intended to provide education and training in quality control (QC) to a broad audience of healthcare practitioners who perform laboratory tests in central laboratories, clinic or outpatient laboratories, and point-of-care settings.

The Levey-Jennings control chart is the workhorse of the laboratory. For healthcare practitioners who perform laboratory tests, it is essential that they understand these tools in order assure the quality of their tests. Control results must be plotted and interpreted using the Levey-Jennings control charts. Critical decisions about in-control and out-of-control results are made on the basis of these charts. Still, many technologist and analysts are confused about the use and interpretation of results on a Levey-Jennings chart.

Multirule QC - often called the "Westgard Rules" - is a commonly used QC procedure in many laboratories. But many technologist and analysts are confused about its use and interpretation.

This course gives definitive explanations of the Levey-Jennings chart and the "Westgard Rules" (multirule procedure), as well as practical advice on how to use and properly interpret control results on one.

Course Goals

When you complete this course, you will be able to:

  • Access internet resources to support continuing education and training in analytical quality management.
  • Define the Levey-Jennings chart.
  • Construct a Levey-Jennings chart
  • Define the different control rules used in multirule QC.
  • Interpret control results on a Levey-Jennings chart using multirule QC procedures to determine if patient test results can be reported and, if not, what type of analytical errors are likely occurring in out-of-control runs.

Course materials

  • This course description provides a summary of each of the lessons.
  • The list at right provides links to all of the lessons/courses (links will appear once you are registered)
  • Each lesson plan provides a summary of that lesson, specific objectives, links to the course materials that are to be used, a list of things to do, and some questions for self- assessment.

Levey-Jennings Charts and "Westgard Rules"

1. How do you plot and interpret control results on a Levey-Jennings chart?
  • Participants will learn to construct Levey-Jennings control charts with appropriate control limits, plot example control data, and interpret the control results.
  • In The Levey-Jennings Control Chart,participants will see how to do this for a cholesterol example.
2. How do you interpret control data using a multirule QC procedure?
  • Participants will be able to interpret control results with a series of rules to determine if patient test results should be reported and, if not, what type of analytical errors are likely occurring in out-of-control runs.
  • In "The Westgard Rules," Dr. Westgard defines the rules commonly included in multirule procedures and provides the rationale for using multiple control rules to interpret control rules.
3. How do you interpret multilevel QC data?
  • Participants will be able to interpret control results when multiple levels of control materials are being analyzed.
  • In QC - the Multirule and Multilevel Interpretation, Dr. Westgard illustrates the interpretation of multiple rules with multiple control materials and multiple analytical runs.
4. What are some common problems encountered while performing QC?
  • Participants will learn to distinguish between good and bad habits for responding to out-of-control signals.
  • In "But...Is it really out?" Doing the Wrong QC Wrong, Dr. Westgard and Sten Westgard discuss common "real world" situations with QC, out-of-control events, and errors in QC Design.
  • In Ten Ways to do the Wrong QC Wrong, Sten Westgard examines user-submitted out-of-control scenarios and explains where the QC went wrong.

Interactive Components

  • Several plotting and graphing tools are linked to lesson pages. Participants can use these tools to construct their own Levey-Jennings charts, and then plot data immediately and put into practice what they've just learned.
  • You are encouraged to submit questions by e-mail.
  • You are encouraged to find a mentor who will be available to discuss the lessons and assessment questions.


Plan Name Price
3 Months: $ 75.00


James O. Westgard, Ph.D.

Courses by this teacher

Name Level Release Date
Method Validation 2008-04-28 13:30:40
Basic QC Practices 2022-04-14 20:03:18
Westgard Rules and Levey-Jennings Charts 2022-04-18 14:39:01
Quality Management and Design for Analytical Systems, an Introduction 2022-04-18 15:34:52
Method Validation Tools 2022-04-29 15:16:33
Basic Quality Management Systems Extras 2022-05-10 13:40:24
Basic QC Book Extras 2022-05-10 15:41:24
Westgard SVP 2022-05-20 14:50:09
Six Sigma Metrics 2022-07-06 19:44:12
Metricas Seis Sigma 2022-07-11 15:30:46
Basic Method Validation Extras 2022-07-14 14:38:38
Joomla SEF URLs by Artio