The Book of OHDSI section 4.2.4 General Conventions of Domains includes Table 4.1 enumerating the thirty (30) domains in use in ATHENA (presumably at that time).
However, if you query the “domain catalog” in ATHENA today (December 2020), you would find 52 distinct domains.
A few of these are the “double domains” like Condition/Measurement for concepts used in columns like
observation.value_as_concept_id (at least, I hope my understanding of this convention is correct). And I see a few new ones that appear to pertain to CDM v6.x:
- Condition Status
- Place of Service
The remaining domains on the list currently have no constituent concepts.
My question: Are these “empty” domains in danger of going away? Or am I free to use them for my custom source concepts (above the 2 billion concept_id threshold)?