{
  "resourceType": "NamingSystem",
  "id": "ObservationSubIdNS",
  "name": "ObservationSubId",
  "status": "draft",
  "kind": "identifier",
  "date": "2026-09-04",
  "publisher": "WELLSTAR Technologies Corp.",
  "responsible": "The reporting laboratory -- the number is assigned in the source result message; this specification names only the URI",
  "description": "Identifies the laboratory's within-report group number on an `Observation.identifier`: the sub-identifier (HL7 v2 OBX-4) that ties the rows of one growth, isolate or panel together inside a single report, and that is printed beside the growth on the paper sheet. Values are small integers assigned by the reporting laboratory, unique only within one report -- they are NOT unique across reports, across patients or over time, and must never be used to identify an observation on their own. THIS IS A DISPLAY LABEL AND NOT THE GROUPING: the link between an isolate and its susceptibilities is `hasMember`, which names its target, while the sub-identifier only says 'the same number as the row above' and so depends on message order. Grouping on it merges two isolates whenever a report reuses a number. It is also not the only identifier an observation carries -- a converted result carries its resource and source identifiers too, and the first entry in `Observation.identifier` is not this one -- so resolve it by system and never by position. The value originates in the inbound result rather than in the chart, and is present only where the source message carried one. MIGRATION: Nexus EMR resolves this system today as http://services.well.com/fhir/observation-sub-id, an address this specification does not publish. It is live in code and in the identifiers inbound results carry, and is under migration to the URI declared here (FHIR-381). Write the URI declared here; expect both until the migration completes.",
  "uniqueId": [
    {
      "type": "uri",
      "value": "https://fhir.apps.health/NamingSystem/observation-sub-id",
      "preferred": true,
      "comment": "The canonical address this specification declares. Author against this one. The writer has not moved yet, so a reader must also match the address below."
    },
    {
      "type": "uri",
      "value": "http://services.well.com/fhir/observation-sub-id",
      "preferred": false,
      "comment": "The pre-migration address. It is live in code and in the identifiers inbound results carry, and is under migration to the preferred URI above. Match it literally when reading; do not write it."
    }
  ]
}