Levey Jennings 10-20-30% Chart in Excel
Uses 10% of the Average to Calculate Control Limits
Healthcare labs use the Levey Jennings Charts to monitor key measures of health like cholesterol and glucose. The Levey Jennings Chart, unlike other SPC charts, has an option to use 10 percent of the average as a way of calculating control limits:
Once the chart is created, you can click on the data sheet created when the macro was run and change the percentage (in cell I1) to 5% or whatever you desire:
QI Macros will update the chart with new control limits. Note: Use the QI Macros chart menu to re-rerun stablility analysis with the new limits. You may also want to adjust the scale of the y-axis:
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 was added to the QI Macros Levey Jennings Fill-in-the-Blanks template in July 2009 and QI Macros menu in December 2010.
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