What is levey-jennings chart?

Levey-Jennings chart is a statistical chart that is used to monitor the performance of a medical laboratory over time. It is named after the American biochemist William A. Levey and his collaborator E. Susanne Jennings.

The chart is a graph where the vertical axis represents the test result, while the horizontal axis represents the time or date when the test was performed. The chart is divided into zones or limits that are based on the laboratory's criteria for acceptable performance. The zones include the mean, two standard deviations (SD), and three SDs, as well as upper and lower control limits.

The Levey-Jennings chart is used to detect trends and shifts in laboratory performance and helps ensure that the results are accurate and reliable. It is often used to monitor quality control data for individual tests and can be used to identify problems before they become significant. The chart is also used to train laboratory staff and identify areas where process improvements can be made to ensure quality test results.