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

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

## category
**Description:** The category of the substance

**Type:** token

**Expression:** Substance.category

**Path:** Substance.category

**Standards Status:** normative

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


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

## code
**Description:** The code of the substance

**Type:** token

**Expression:** Substance.code.concept

**Path:** Substance.code.concept

**Standards Status:** normative

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


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

## code-reference
**Description:** A reference to the defining substance

**Type:** reference

**Expression:** Substance.code.reference

**Path:** Substance.code.reference

**Standards Status:** normative

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


<a id="expiry"></a>

## expiry
**Description:** Expiry date of package or container of substance

**Type:** date

**Expression:** Substance.expiry

**Path:** Substance.expiry

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/Substance-expiry


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

## identifier
**Description:** Unique identifier for the substance

**Type:** token

**Expression:** Substance.identifier

**Path:** Substance.identifier

**Standards Status:** normative

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


<a id="quantity"></a>

## quantity
**Description:** Amount of substance in the package

**Type:** quantity

**Expression:** Substance.quantity

**Path:** Substance.quantity

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/Substance-quantity


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

## status
**Description:** active | inactive | entered-in-error

**Type:** token

**Expression:** Substance.status

**Path:** Substance.status

**Standards Status:** normative

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