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

<a id="classification"></a>

## classification
**Description:** High or low level categorization, e.g. polymer vs. nucleic acid or linear vs. branch chain

**Type:** token

**Expression:** SubstanceDefinition.classification

**Path:** SubstanceDefinition.classification

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/SubstanceDefinition-classification


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

## code
**Description:** The specific code

**Type:** token

**Expression:** SubstanceDefinition.code.code

**Path:** SubstanceDefinition.code.code

**Standards Status:** normative

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


<a id="domain"></a>

## domain
**Description:** If the substance applies to only human or veterinary use

**Type:** token

**Expression:** SubstanceDefinition.domain

**Path:** SubstanceDefinition.domain

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/SubstanceDefinition-domain


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

## identifier
**Description:** Identifier by which this substance is known

**Type:** token

**Expression:** SubstanceDefinition.identifier

**Path:** SubstanceDefinition.identifier

**Standards Status:** normative

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


<a id="name"></a>

## name
**Description:** The actual name

**Type:** string

**Expression:** SubstanceDefinition.name.name

**Path:** SubstanceDefinition.name.name

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/SubstanceDefinition-name


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

## status
**Description:** Status of substance within the catalogue e.g. active, retired

**Type:** token

**Expression:** SubstanceDefinition.status

**Path:** SubstanceDefinition.status

**Standards Status:** normative

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