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🧪 Laboratory QC (L-J / Westgard)
Levey-Jennings chart + Westgard multi-rules (1-2s/1-3s/2-2s/R-4s/4-1s/10x)
QC baseline (optional; if blank, estimated from this batch)
QC measurements (one per line)
Westgard Multi-Rules
· 1-2s: one point beyond ±2SD → warning (watch closely; alone is not out-of-control).
· 1-3s, 2-2s, R-4s, 4-1s, 10x: any trigger = out of control; stop testing, investigate, then rerun.
· Tip: at least 1 control per run; before introducing a new control lot, accumulate 20 runs to set mean/SD as baseline (can be entered manually here).
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About Laboratory Internal QC Tool
Run laboratory internal quality control online: Levey-Jennings control charts with automatic Westgard multi-rule interpretation for assay stability.
Learn more about this tool →
Z-score Proficiency Testing
Method Comparison (Bland-Altman)
Analytical Method Validation
Calibration Curve & Linearity
Repeatability & Reproducibility (ISO 5725)
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