1.What is Levey-Jennings QC Chart?

The Levey-Jennings control chart is a graphical tool used in quality control to monitor and assess the performance of a laboratory test or process over time. It is named after two statisticians, Edward S. Levey and Ruth S. Jennings, who first proposed the chart in 1950. It is a useful tool for laboratories and other quality control settings, as it allows for ongoing monitoring and assessment of test or process performance, which can help to identify and correct issues before they become major problems.

The chart is a time-series graph that displays the distribution of control measurements (or quality control samples) plotted against time. The data points are plotted on the y-axis, and time is plotted on the x-axis. Typically, the mean and standard deviation of the control measurements are calculated and plotted as a horizontal line and two additional lines are drawn at +/- 2 or 3 standard deviations.
The purpose of the chart is to visually detect shifts or trends in the control measurements over time, which may indicate that the test or process is out of control or has an unacceptable level of variation. The chart can also be used to calculate and monitor other statistical parameters, such as the coefficient of variation and the %RSD (relative standard deviation), which can help to identify potential issues with the test or process.

Levey-Jenning chart – YouTube

https://m.youtube.com/watch?v=v3lVQGT1–o

This video introduces the Levey-Jenning chart – its concept, creation, interpretation and usage.