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I found a similar question (link below) but it didn't quite address my question. I'm hoping to understand if there is a convention in FHIR for searching across multiple resources with a single request. For instance, I want to find all patients that have a Med Order for drug NNN who also have an Observation with LOINC-code XYZ. A request such as

[base]/Observation?subject=Patient/123&code=8480-6

gets me partway there but then I would have to execute a 2nd query to filter based on the med orders

Here is the similar question: Is it possible to search multiple FHIR resources with a single GET Request

Bill Harty
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  • also posted this question on Zulip and Lloyd McKenzie pointed me to the "_has" parameter - see http://hl7.org/fhir/STU3/search.html#has. This seems to be what I was looking for. – Bill Harty Jul 18 '17 at 15:50

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