This page is part of the FHIR Specification (v4.3.0: R4B -  STU). This is a downloaded version of the specification.  For a full list of available versions, see the Directory of published versions 
Orders and Observations   Work Group | Maturity Level: 2 | Trial Use | Security Category: Business | Compartments: Not linked to any defined compartments | 
Detailed Descriptions for the elements in the Substance resource.
| Substance | |
| Element Id | Substance | 
| Definition | A homogeneous material with a definite composition.  | 
| Cardinality | 0..* | 
| Type | DomainResource | 
| Summary | false | 
| Substance.identifier | |
| Element Id | Substance.identifier | 
| Definition | Unique identifier for the substance.  | 
| Note | This is a business identifier, not a resource identifier (see discussion) | 
| Cardinality | 0..* | 
| Type | Identifier | 
| Summary | true | 
| Comments | This identifier is associated with the kind of substance in contrast to the Substance.instance.identifier which is associated with the package/container.  | 
| Substance.status | |
| Element Id | Substance.status | 
| Definition | A code to indicate if the substance is actively used.  | 
| Cardinality | 0..1 | 
| Terminology Binding | FHIRSubstanceStatus (Required) | 
| Type | code | 
| Is Modifier | true (Reason: This element is labelled as a modifier because it is a status element that contains status entered-in-error which means that the resource should not be treated as valid) | 
| Summary | true | 
| Substance.category | |
| Element Id | Substance.category | 
| Definition | A code that classifies the general type of substance. This is used for searching, sorting and display purposes.  | 
| Cardinality | 0..* | 
| Terminology Binding | Substance Category Codes (Extensible) | 
| Type | CodeableConcept | 
| Summary | true | 
| Comments | The level of granularity is defined by the category concepts in the value set. More fine-grained filtering can be performed using the metadata and/or terminology hierarchy in Substance.code.  | 
| Substance.code | |
| Element Id | Substance.code | 
| Definition | A code (or set of codes) that identify this substance.  | 
| Cardinality | 1..1 | 
| Terminology Binding | Substance Code (Example) | 
| Type | CodeableConcept | 
| Summary | true | 
| Comments | This could be a reference to an externally defined code. It could also be a locally assigned code (e.g. a formulary), optionally with translations to the standard drug codes.  | 
| Substance.description | |
| Element Id | Substance.description | 
| Definition | A description of the substance - its appearance, handling requirements, and other usage notes.  | 
| Cardinality | 0..1 | 
| Type | string | 
| Summary | true | 
| Substance.instance | |
| Element Id | Substance.instance | 
| Definition | Substance may be used to describe a kind of substance, or a specific package/container of the substance: an instance.  | 
| Cardinality | 0..* | 
| Meaning if Missing | If this element is not present, then the substance resource describes a kind of substance | 
| Summary | true | 
| Substance.instance.identifier | |
| Element Id | Substance.instance.identifier | 
| Definition | Identifier associated with the package/container (usually a label affixed directly).  | 
| Note | This is a business identifier, not a resource identifier (see discussion) | 
| Cardinality | 0..1 | 
| Type | Identifier | 
| Summary | true | 
| Substance.instance.expiry | |
| Element Id | Substance.instance.expiry | 
| Definition | When the substance is no longer valid to use. For some substances, a single arbitrary date is used for expiry.  | 
| Cardinality | 0..1 | 
| Type | dateTime | 
| Summary | true | 
| Substance.instance.quantity | |
| Element Id | Substance.instance.quantity | 
| Definition | The amount of the substance.  | 
| Cardinality | 0..1 | 
| Type | SimpleQuantity | 
| Summary | true | 
| Substance.ingredient | |
| Element Id | Substance.ingredient | 
| Definition | A substance can be composed of other substances.  | 
| Cardinality | 0..* | 
| Summary | true | 
| Substance.ingredient.quantity | |
| Element Id | Substance.ingredient.quantity | 
| Definition | The amount of the ingredient in the substance - a concentration ratio.  | 
| Cardinality | 0..1 | 
| Type | Ratio | 
| Summary | true | 
| Substance.ingredient.substance[x] | |
| Element Id | Substance.ingredient.substance[x] | 
| Definition | Another substance that is a component of this substance.  | 
| Cardinality | 1..1 | 
| Terminology Binding | Substance Code (Example) | 
| Type | CodeableConcept|Reference(Substance) | 
| [x] Note | See Choice of Data Types for further information about how to use [x] | 
| Summary | true |