Westgard Rules
How Kanta applies Westgard multi-rule QC to your data.
Kanta applies Westgard multi-rule QC automatically when you submit a QC run. You do not need to evaluate rules manually — Kanta flags which rule(s) were violated and whether the run is a warning or a rejection.
The rules Kanta applies
| Rule | Description | Action |
|---|---|---|
| 1₂s | One value exceeds ±2 SD | Warning — investigate but do not reject |
| 1₃s | One value exceeds ±3 SD | Reject — do not release patient results |
| 2₂s | Two consecutive values exceed the same ±2 SD limit | Reject |
| R₄s | Two consecutive values span more than 4 SD (one above +2 SD, one below −2 SD) | Reject |
| 4₁s | Four consecutive values exceed the same ±1 SD limit on the same side | Warning |
| 10x | Ten consecutive values on the same side of the mean | Reject |
How Kanta displays rule violations
After submitting a QC run, the result row shows:
- ✅ Pass — all Westgard rules satisfied
- ⚠️ Warning — a warning rule triggered (1₂s or 4₁s); investigate, consider running QC again before releasing results
- ❌ Reject — a rejection rule triggered; do not release patient results from this analyser; corrective action required
Click the violation badge to see exactly which rule failed and for which parameter.
Multi-level QC
Kanta evaluates Westgard rules across all QC levels simultaneously. A 2₂s violation can be detected across two different control levels (e.g. Normal and Abnormal High both drift in the same direction) — Kanta catches this and flags it accordingly.
Configuring which rules to apply
By default, all standard Westgard rules are active. Lab Managers can configure which rules to apply per analyser:
- Go to Admin → Lab Sections → select section → Analysers
- Click the analyser → QC Settings
- Toggle individual Westgard rules on or off
- Set whether 1₂s should be a warning or a rejection for your laboratory's policy
For help, contact your Lab Manager or email [email protected].