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README.md

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+---
+title: RefLab
+emoji: 🧪
+colorFrom: gray
+colorTo: green
+sdk: static
+pinned: false
+license: mit
+short_description: Tietz 7e reference intervals and biological variation
+---
+
+# RefLab
+
+Reference-interval lookup built from Appendix A of the Tietz Textbook of Clinical Chemistry and
+Molecular Diagnostics, 7th edition (Tables A.1–A.5), with Ricos biological-variation
+specifications attached where they exist.
+
+- **RefCheck** — analyte, age, sex and a result in either unit; verdict, interval in both units,
+  conversion factor, critical-value flag.
+- **RefSurf** — every partition an analyte has, as tables, range bars and interval-versus-age plots.
+- **Critical** — Table A.5 risk thresholds.
+
+429 entries · 2447 partitions · 64 critical values · 114 analytes with biological-variation data.
+
+Everything runs client-side in a single `index.html`; no server, no network calls.
+
+Reference intervals are method- and population-dependent. Each laboratory establishes or verifies
+its own intervals (CLSI EP28-A3c) before clinical use. Not a diagnostic device.