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Object Identifiers (OIDs)

Pan-Canadian Standards use Object Identifiers (OIDs) to distinguish between objects by assigning a numeric string that enables other systems to understand the unique information that is being shared between various systems.

  • OIDs are intended to be globally unique and never re-used
  • OIDs in the pan-Canadian standards identify terminology code systems and are transmitted in HL7 messages
  • OIDS used to identify terminology subsets are not transmitted in HL7 messages, rather these OIDs are used for vocabulary maintenance and Terminology Services
  • OIDs are used to qualify local identifiers (e.g. patient identifiers) such that the combination of an OID (assigning authority) and a local identifier remains globally unique

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