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This endpoint provides information about all domains available in the OMOP vocabulary system. Domains represent high-level categorizations that group medical concepts by their semantic meaning, such as Condition, Drug, Procedure, and others.

Query Parameters

include_stats
boolean
default:"false"
Include concept counts and vocabulary coverage for each domain
vocab_release
string
Specific vocabulary release version to query
Example: 2025.1

Response

domains
array
Array of domain objects with their properties
meta
object
Response metadata

Usage Examples

Basic Domain List

Get all available domains:
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Domains with Statistics

Get domains with concept counts and vocabulary coverage:
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Filter by Vocabulary Coverage

Find domains that include concepts from a specific vocabulary:
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Notes

  • Domains provide the highest level of semantic categorization in OMOP
  • The most commonly used clinical domains are Condition, Drug, Procedure, and Measurement
  • Use include_stats=true to get concept counts for capacity planning and analysis
  • The vocabulary_coverage field shows which vocabularies contribute concepts to each domain