FHIR’s _count & _summary Parameters

How do you get a total resource count in FHIR?

Say you want to know the number of Procedures with a status of ‘on-hold’.

Here are two ways.

In SQL this would look like:

select count(*) from Procedure where status=on-hold

In FHIR your query would be:

/Procedure/?status=on-hold&_summary=count

or

/Procedure/?status=on-hold&_count=0

Example query 1: http://hapi.fhir.org/baseR4/Procedure/?status=on-hold&_summary=count

Example query 2: http://hapi.fhir.org/baseR4/Procedure/?status=on-hold&_count=0

Simple, yet so many FHIR developers don’t know how to do this.

Discussion

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