Use _typeFilter on a FHIR Bulk Data $export to scope the export to a specific subset of resources meeting filter criteria

In-depth guide

Steps

1. Confirm the server advertises support for _typeFilter in its CapabilityStatement or SMART configuration before using it
2. Construct a _typeFilter value as a URL-encoded FHIR search parameter string scoped to a resource type, for example Observation?category=laboratory
3. Include _typeFilter alongside _type in the $export kickoff request; _type restricts which resource types are exported while _typeFilter applies search filters within those types
4. Kick off the export with GET [base]/Patient/$export?_type=Observation&_typeFilter=Observation%3Fcategory%3Dlaboratory and the required Prefer and Accept headers
5. Poll and download as with a standard bulk export; the resulting NDJSON will contain only resources matching the filter
6. Validate that the manifest output entries reflect the expected resource type and that record counts are consistent with a direct FHIR search using the same parameters