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

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

## identifier
**Description:** The unique identity for a particular sequence

**Type:** token

**Expression:** MolecularDefinition.identifier

**Path:** MolecularDefinition.identifier

**Standards Status:** normative

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


<a id="moleculetype"></a>

## moleculetype
**Description:** Amino Acid Sequence/ DNA Sequence / RNA Sequence

**Type:** token

**Expression:** MolecularDefinition.moleculeType

**Path:** MolecularDefinition.moleculeType

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/MolecularDefinition-moleculeType


<a id="topology"></a>

## topology
**Description:** The structural topology of the molecular entity (e.g., linear, circular)

**Type:** token

**Expression:** MolecularDefinition.topology

**Path:** MolecularDefinition.topology

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/MolecularDefinition-topology


<a id="member"></a>

## member
**Description:** Reference to the state of the molecular member

**Type:** reference

**Expression:** MolecularDefinition.member

**Path:** MolecularDefinition.member

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/MolecularDefinition-member


<a id="type"></a>

## type
**Description:** Classification of the molecule into types other than those defined by moleculeType

**Type:** token

**Expression:** MolecularDefinition.type

**Path:** MolecularDefinition.type

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/MolecularDefinition-type