LOINC

1. LOINC users' guide

   Scope and structure of LOINC.

2. Parts of a LOINC term

   Six axes: component, property, time, system, scale and method.

3. LOINC and FHIR

   LOINC FHIR terminology service and resource usage.

4. Downloads and tables

   Release files, Loinc.csv and mapping tables.

5. Panels and forms

   Panels and forms for grouped observations.

6. Document ontology

   Document type codes used in clinical notes and CDA.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.