---
type: "search-params"
title: "ObservationDefinition Search Parameters"
resource: "ObservationDefinition"
---
# ObservationDefinition Search Parameters

<a id="category"></a>

## category
**Description:** Category (class) of observation

**Type:** token

**Expression:** ObservationDefinition.category

**Path:** ObservationDefinition.category

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-category


<a id="code"></a>

## code
**Description:** Observation code

**Type:** token

**Expression:** ObservationDefinition.code

**Path:** ObservationDefinition.code

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-code


<a id="experimental"></a>

## experimental
**Description:** Not for genuine usage (true)

**Type:** token

**Expression:** ObservationDefinition.experimental

**Path:** ObservationDefinition.experimental

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-experimental


<a id="identifier"></a>

## identifier
**Description:** The unique identifier associated with the specimen definition

**Type:** token

**Expression:** ObservationDefinition.identifier

**Path:** ObservationDefinition.identifier

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-identifier


<a id="method"></a>

## method
**Description:** Method of observation

**Type:** token

**Expression:** ObservationDefinition.method

**Path:** ObservationDefinition.method

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-method


<a id="status"></a>

## status
**Description:** Publication status of the ObservationDefinition: draft, active, retired, unknown

**Type:** token

**Expression:** ObservationDefinition.status

**Path:** ObservationDefinition.status

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-status


<a id="title"></a>

## title
**Description:** Human-friendly name of the ObservationDefinition

**Type:** string

**Expression:** ObservationDefinition.title

**Path:** ObservationDefinition.title

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-title


<a id="url"></a>

## url
**Description:** The uri that identifies the observation definition

**Type:** uri

**Expression:** ObservationDefinition.url

**Path:** ObservationDefinition.url

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-url


<a id="reference"></a>

## reference
**Description:** Body structure to be observed (reference)

**Type:** reference

**Expression:** ObservationDefinition.bodyStructure.reference

**Path:** ObservationDefinition.bodyStructure.reference

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-body-structure-reference


<a id="body-structure-code"></a>

## body-structure-code
**Description:** Code for body structure to be observed

**Type:** token

**Expression:** ObservationDefinition.bodyStructure.concept

**Path:** ObservationDefinition.bodyStructure.concept

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/ObservationDefinition-body-structure-code