Patricia L. Barry, co-author of Cost-Effective Quality Control: Managing the Quality and Productivity of Analytical Processes, provides a primer on how to construct, use, and interpret …

Introduced in 1950 by Stanley Levey and E. R. Jennings for clinical laboratories. This article explains what an LJ chart is, how it differs from other control charts, where it is most effective, …

A Levey–Jennings chart is a graph that quality control data is plotted on to give a visual indication whether a laboratory test is working well. The distance from the mean is measured in standard …

The Levey-Jennings control chart is a special case of the common Shewart Xbar (variables) chart in which there is only a single stream of data and sigma is estimated using the standard …

The Levey-Jennings chart is used almost exclusively in laboratory settings. It uses a chart very similar to the Individual-Range chart, the major difference being that it only uses the Primary …

Dec 3, 2024 · The Levy-Jennings chart, named after S.J. Levy and J.E. Jennings, is a graphical representation of QC data over time. It is used to monitor the stability and precision of …

Jul 21, 2025 · The Levey-Jennings (LJ) chart is a graphical representation of measured results of control samples over time. It is used to identify deviations, shifts and trends in analytical …

Discover Levey-Jennings charts in labs: assess method stability, plot control results over time. Dive into application and significance.

Aug 20, 2025 · As a US lab technician, understanding how to create and interpret these charts is crucial for ensuring the accuracy and reliability of patient results. This guide provides a simple, …

Oct 9, 2023 · The L-J Chart is simply a graph paper that allows us to plot the measurements of controls against the mean and between 1 to 3 standard deviations SD. That way we get a …