The Levey-Jennings QC (Quality Control) chart is a graphical tool used in statistical process control to monitor and assess the quality of laboratory test results over time. It is named after Dr. Abraham Levey and Dr. Leonard Jennings, who developed this technique in the 1950s.

The Levey-Jennings chart consists of a series of individual data points plotted over time, with the x-axis representing time (e.g., days, weeks, months) and the y-axis representing the test results. The chart typically includes a centerline, which represents the expected or target value of the test result, and control limits, which are calculated based on the standard deviation of the test results.

The purpose of the Levey-Jennings chart is to visually detect trends or patterns in the test results, as well as to identify potential outliers or points that fall outside of the control limits. This allows laboratory personnel to quickly identify if the test results are within acceptable quality control limits or if there are any issues that may impact the accuracy and reliability of the test results.

The Levey-Jennings chart is commonly used in clinical laboratories to monitor the performance of various analytical methods, such as chemistry, hematology, and microbiology assays. It helps laboratories ensure that their test results are accurate and reliable, and it aids in identifying and resolving any potential issues in the testing process.