| # | Date | QC Value | Z-Score | Status | |
|---|---|---|---|---|---|
| No entries yet. Add a date and value above to start your daily log. | |||||
Step 1: Set Up Your Session Details
Before entering any values, fill in the basic session information — laboratory name, analyst name, test name, and the month/year being tracked. This keeps every chart properly labeled, which matters later if you’re comparing sessions or attaching the export to an audit file.
Step 2: Enter Your QC Data
You have two ways to get values into the tool:
Data Input box — paste or type in a batch of QC values at once. You’ll need at least two numeric values before the tool can calculate a mean and standard deviation. Daily Log — add one QC value per day as your instrument produces it. Each entry is timestamped and auto-saved in your browser, so you can build up a full month’s log entry by entry without losing data on refresh.
If your control material already has an established mean and SD from the manufacturer or your own cumulative data, use the Custom Mean & SD override fields instead of letting the tool calculate them from a short run.
Step 3: Plot the Chart
Click Plot Chart to generate the Levey-Jennings plot from the Data Input box, or Plot from Log to chart everything saved in your Daily Log, arranged automatically in date order. The chart displays your mean line along with ±1 SD, ±2 SD, and ±3 SD boundaries, and color-codes each point as in-control, warning, or reject.
Step 4: Read the Westgard Rule Interpretation
This is where the tool saves the most time. Instead of manually checking each Westgard rule against your data points, the engine evaluates the multi-rule set automatically and flags any violations alongside an overall QC decision — accept the run or investigate before releasing patient results.
Step 5: Track Trends and Export Records
Once you’re done reviewing:
- Export CSV or Export PDF to keep a permanent, shareable record for your quality file or ISO 15189 audit trail.
- Save Session to store the run for later comparison — the tool can chart mean trends across multiple saved sessions, which is useful for spotting slow drift across months.
- Import CSV if you already maintain QC data elsewhere and want to bring it into the tool for analysis.
