Should I use manufacturer or calculated limits?

Use the manufacturer's target mean and SD while a new lot is being established, then switch to your laboratory's own calculated mean and SD once you have about 20 data points.

Is my QC data uploaded anywhere?

No. All calculations and charting happen in your browser. Nothing is stored or sent to a server; values are cleared when the page is closed.

Does this tool apply Westgard rules?

Yes. It checks 1-2s (warning), 1-3s, 2-2s, R-4s, 4-1s and 10x on a single control level and flags violations in the table, chart and printout. Multi-level rules and corrective-action logging are available in Phoenicx QCPlotter Pro.

Levey-Jennings Quality Control Chart Maker

Q: What is a Levey-Jennings chart?

A Levey-Jennings (LJ) chart plots daily quality control results against the mean and ±1, ±2 and ±3 standard deviation limits, so laboratories can spot random and systematic errors before reporting patient results.

Plot daily QC data, calculate Mean, SD, CV%, and generate professional audit-ready charts instantly.

Runs in your browserLäuft im Browser A4 print-readyA4-druckfertig Westgard rulesWestgard-Regeln Up to 70 runs on 1 pageBis 70 Läufe auf 1 Seite 6 languagesSprachen

Chart & QC Details

Laboratory / Hospital Name

Parameter

Month & Year

QC Material Name (Optional)

Lot No.

Level

Manufacturer Setup

Target Mean

Target SD

Data Entry

Date (Optional)

Control Value

Paste many values

One value per line (or separated by commas/spaces). Dates continue from the date above.

0.00

Calc. Mean

0.00

Calc. SD

0.00%

CV %

–

Min – Max

Chart Settings

Evaluate Limits Using:

Check Westgard rules

Print with values

Print sign-off box

Nothing is saved or uploaded — data stays only while this page is open.

NewGet Phoenicx QCPlotter ProFull Westgard, Six Sigma & desktop app

About This Tool

Generate professional Levey-Jennings (LJ) quality control charts instantly with this free online LJ chart maker. Designed for medical laboratories, this secure browser-based tool allows you to plot daily QC data, automatically calculate Mean, SD, and CV%, and generate audit-ready printouts in seconds.

Tutorial for help: youtu.be/NtdtkSd8Cec

Your Levey-Jennings chart will appear here

Add your QC values on the left — the chart, Mean, SD, CV% and Westgard checks update instantly.

1Enter lab & QC details
2Add or paste daily values
3Review rules & print

Performed by

Reviewed by

Date

Corrective action

Created using www.phoenicx.org · Free Levey-Jennings chart maker

Data Log

#	Run / Date	Value	SDI	Rule	Actions
No data points added yet.

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User Reviews

Guide

How to make a Levey-Jennings chartSo erstellen Sie ein Levey-Jennings-Diagramm

Enter QC detailsQC-Details eingeben
Add lab name, parameter (e.g. Glucose), month, QC material, lot and level. These appear on the printout.Laborname, Parameter (z. B. Glukose), Monat, QC-Material, Lot und Level eintragen. Sie erscheinen auf dem Ausdruck.
Add daily control valuesTägliche Kontrollwerte eintragen
Type each run's value and press Enter, or paste a whole month at once. Mean, SD, CV% and Westgard flags update live.Jeden Wert eingeben und Enter drücken. Das Datum springt automatisch weiter; Mittelwert, SD und CV% aktualisieren sich live.
Choose limits & printGrenzen wählen & drucken
Evaluate against manufacturer or your calculated limits, then print a one-page A4 landscape chart — with up to 70 runs, their dates and values, Westgard flags and a sign-off box.Gegen Hersteller- oder berechnete Grenzen bewerten und ein einseitiges A4-Querformat drucken – auf Wunsch mit Werten.

FAQ

Levey-Jennings chart FAQFAQ zum Levey-Jennings-Diagramm

What is a Levey-Jennings chart?Was ist ein Levey-Jennings-Diagramm?

It plots daily quality-control results against the mean and ±1, ±2 and ±3 SD limits, so the lab can spot random and systematic errors before patient results are reported.Es stellt tägliche QC-Ergebnisse gegen Mittelwert und ±1, ±2 und ±3 SD dar, damit das Labor zufällige und systematische Fehler erkennt, bevor Patientenergebnisse freigegeben werden.

Manufacturer or calculated limits?Hersteller- oder berechnete Grenzen?

Use the manufacturer's target mean and SD while establishing a new lot, then switch to your own calculated mean and SD once you have about 20 data points.Für ein neues Lot zunächst Herstellerwerte nutzen und nach etwa 20 Datenpunkten auf eigene berechnete Werte umstellen.

How is CV% calculated?Wie wird CV% berechnet?

CV% = (SD ÷ Mean) × 100, using the sample standard deviation (n − 1) of the values you entered.CV% = (SD ÷ Mittelwert) × 100, mit der Stichproben-Standardabweichung (n − 1) Ihrer Werte.

Does it apply Westgard rules?Werden Westgard-Regeln angewendet?

Yes. It checks 1_2s (warning), 1_3s, 2_2s, R_4s, 4_1s and 10_x on one control level and flags each run in the table, on the chart and on the printout. For multi-level rules, corrective-action logging and audit trails, use Phoenicx QCPlotter Pro.Ja. Geprüft werden 1_2s (Warnung), 1_3s, 2_2s, R_4s, 4_1s und 10_x für ein Kontrolllevel – markiert in Tabelle, Diagramm und Ausdruck. Für Mehrlevel-Regeln, Korrekturmaßnahmen und Audit-Trails nutzen Sie Phoenicx QCPlotter Pro.

Is my data saved or uploaded?Werden meine Daten gespeichert oder hochgeladen?

No. Everything runs in your browser and nothing is stored — your values disappear when you close or refresh the page. Print the chart or export CSV / PNG before leaving.Nein. Alles läuft im Browser und nichts wird gespeichert – beim Schließen oder Neuladen sind die Werte weg. Vorher drucken oder als CSV / PNG exportieren.

About This Tool

Your Levey-Jennings chart will appear here

Data Log

User Reviews

How to make a Levey-Jennings chartSo erstellen Sie ein Levey-Jennings-Diagramm

Enter QC detailsQC-Details eingeben

Add daily control valuesTägliche Kontrollwerte eintragen

Choose limits & printGrenzen wählen & drucken

Levey-Jennings chart FAQFAQ zum Levey-Jennings-Diagramm