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Levey Jennings Control Chart

It's Easy to Create a Levey Jennings Chart in Excel

Healthcare labs use the Levey Jennings charts to monitor key measures of health like cholesterol and glucose. The Levey Jennings chart, unlike other control charts, use standard deviation or 10-20-30 percent for control limits.

QI Macros Add-in for Excel can create either type of Levey Jennings chart in seconds

QI Macros offers two ways to create these Levey Jennings Charts

To create a Levey Jennings chart using one of the macros:

1. Click and drag over your data to select it.
2. Next, click on the QI Macros menu -> Control Charts (SPC) -> Special (CUSUM, EWMA) and then on the type of Levey Jennings chart you want.
   
   
3. QI Macros will perform all of the calculations, draw the chart and turn any unstable points or conditions red.

Levey Jennings Stdev, uses standard deviation to draw the 1 and 2 sigma lines and the upper and lower control limits. You can also use this chart to create a Precision Control Chart.

Levey Jennings 10 % draws 1, 2 sigma lines and upper and lower control limits using 10 %, 20% and 30% of the average. This percentage can be adjusted if another value is desired.

According to SOFT / AAFS FORENSIC TOXICOLOGY LABORATORY GUIDELINES 9.1.12 standard deviation may represent an unacceptably large percentage deviation from the mean. Therefore, a realistic percentage deviation should be used, such as ±20% or ±30%. This option is available in the Levey Jennings 10% Macro and Levey Jennings Fill in the Blanks template.

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