---
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.