Levey-Jennings QC chart, also known as a control chart, is a graphical tool that is widely used in healthcare laboratories to monitor the quality of the results of diagnostic tests. It is named after two American statisticians, Levey and Jennings, who introduced this chart in 1950.

The chart consists of a series of data points plotted on a graph, with the mean and standard deviation (SD) of the data calculated and plotted as horizontal lines. The data points are obtained by analyzing control samples, which are samples with known values that are run alongside the patient samples.

The control samples are analyzed at regular intervals, and the resulting data points are plotted on the Levey-Jennings chart. The chart helps laboratory professionals to detect trends or shifts in the data over time, which can indicate a problem with the testing process or equipment.

The chart also allows for the determination of the precision and accuracy of the test results. The QC chart can help laboratory professionals to ensure that their testing processes are in control and that the results they produce are reliable and accurate.

Here’s a video that provides a template for the LJQC Chart and how it is created.