Levey-Jennings Chart Plotter using Westgard Rules
Enter QC values as comma-separated numbers. The tool will plot a Levey-Jennings chart and automatically evaluate against Westgard rules.
QC Data Input
Enter at least 10 values for proper Westgard rules evaluation.
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Levey-Jennings Chart
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Target Mean
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Standard Deviation
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CV (%)
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Rule Violations
Westgard Rules Evaluation
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Enter your QC data and click "Plot & Analyze" to evaluate against Westgard rules.
Westgard Rules Explained
1:2s Rule
One control measurement exceeds 2 standard deviations from the mean.
1:3s Rule
One control measurement exceeds 3 standard deviations from the mean.
2:2s Rule
Two consecutive control measurements exceed 2 standard deviations on the same side of the mean.
R:4s Rule
The range between two control measurements exceeds 4 standard deviations.
4:1s Rule
Four consecutive control measurements exceed 1 standard deviation on the same side of the mean.
10:x Rule
Ten consecutive control measurements fall on the same side of the mean.
