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Welcome to Chapter 3: Levey-Jennings Charts amp;amp; Westgard Rules. Standard deviation is commonly used for preparing Levey-Jennings (L-J or LJ) charts. The Levey-Jennings chart is used to graph successive (run-to-run or day-to-day) quality control values. A chart is created for each test and level of control. The first step is to calculate decision limits. These limits are 1s, 2s and 3s from the mean. Lets begin with the data set from the previous module. The mean for the Level I potassium control is 4.1 mmol/L and the standard deviation is 0.1 mmol/L. This is an illustration of how 1s, 2s and 3s quality control limits are calculated using that mean and standard deviation. The Levey-Jennings chart we have developed can be overlaid onto a bell-shaped curve to illustrate the overall distribution of quality control values. When an analytical process is within control, approximately 68% of all QC values fall within 1 standard deviation (1s). Likewise 95.5% of all QC values fall