Originally developed by S. Levey and E.R. Jennings in the 1950s for use in clinical laboratories, the chart allows analysts to instantly see if a measurement is drifting out of acceptable range or if a "shift" in the process has occurred.
Adjust the Y-axis to show the Mean as the center line and standard deviation lines as distinct boundaries. Interpretation: The Westgard Rules levey jennings chart template free
Once you download your , follow these steps to start monitoring your QC data. Originally developed by S
| Violation | Indication | Action | |-----------|------------|--------| | 13s | Random error | Reject run, troubleshoot | | 22s | Systematic error | Check calibration, reagents | | 41s | Shift | Review instrument stability | | 10x | Long-term drift | Recalibrate | Adjust the Y-axis to show the Mean as
Free Levey–Jennings chart templates provide a practical, accessible entry into laboratory quality control. When sourced from reputable sites and used with proper understanding of Westgard rules, they meet basic QC requirements for many settings. For high-volume or regulated clinical labs, a commercial QC system is preferable, but for teaching, research, and small-scale testing, free spreadsheet-based templates offer an excellent balance of cost and functionality.