The Levey-Jennings QC (Quality Control) chart is a useful graphical tool used in quality control to monitor and analyze data obtained from laboratory tests or processes. It was created in the 1950s by statisticians Robert D. Levey and William A. Jennings, and helps to ensure accuracy and consistency in the data collected.

The Levey-Jennings chart is a tool for tracking trends, shifts, and patterns in data over time. It displays test results on the y-axis and time on the x-axis. The chart has a centerline representing the mean value of the test results, and upper and lower control limits set at a specific number of standard deviations from the mean.

Clinical laboratories commonly use the Levey-Jennings chart to track the consistency and accuracy of a test over time. Additionally, it helps identify any potential systematic errors or biases that may arise during the testing process.

To ensure reliable and accurate test results, laboratory personnel can analyze data using a Levey-Jennings chart on a regular basis. By identifying any outliers or trends, the laboratory can investigate and take corrective action to improve test quality.