CodeSystem search vs lookup

[Rajesh Katarya]

Trying to understand the difference between search and lookup.

For example:

CodeSystem search supports both code and name parameters

GET call

/CodeSystem?code=2093-3

returns nothing

I tried to be specific to a code system:

/CodeSystem?code=2093-3&name=LOINC

also returns nothing

Moving to use lookup:

/CodeSystem/$lookup?system=http://loinc.org&code=2093-3

works.

Can anyone help me in explaining the difference between the two approaches.

Also, would like to know how to filter by a specific property ( and property value )

As an example, for GET call like this /CodeSystem/$lookup?system=http://loinc.org&code=2093-3

I only want to get value of the STATUS property ( to reduce response pay load) and not see/get any other properties.

Thanks much.

-Rajesh

[James Agnew]

For external CodeSystems (ones that are loaded using the terminology loader, such as LOINC and SCT), only the $lookup operation works as the regular resource indexing won't index contents that aren't in the resource body.

Cheers,

James

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[jagadesh doddi]

I can seach code system with http://localhost:8080/hapi-fhir-jpaserver/fhir/CodeSystem/$lookup?system=http://snomed.info/sct&code=39065001&_format=json

It returns

 {

  "resourceType": "Parameters",
  "parameter": [
    {
      "name": "name",
      "valueString": "SNOMED CT"
    },
    {
      "name": "display",
      "valueString": "Burn of ear structure"
    },
    {
      "name": "abstract",
      "valueBoolean": false
    }
  ]
}

How do I search for codes by display name? I want all the codes with display name "Burn" in it. 

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[david....@gmail.com]

I'm not sure about the hapi side of things, but you can do a ValueSet $expand.

https://ontoserver.csiro.au/stu3-latest/ValueSet/$expand?url=http://snomed.info/sct?fhir_vs&filter=Burn&count=20&active=true

Snomed CT has a number of implicit valuesets in fhir. 

http://snomed.info/sct?fhir_vs is a valueset for all on snomed.

http://snomed.info/sct?fhir_vs=isa/125666000  to get all children of concept 125666000

http://snomed.info/sct?fhir_vs=refset/32570481000036109  to get concepts in the refset 32570481000036109(Emergency department diagnosis reference set)

If there is no valueset for your codesystem you may need to post the $expand request so you can define one.