EHDS Logical Information Models
0.2.1 - qa-preview

EHDS Logical Information Models, published by Xt-EHR. This guide is not an authorized publication; it is the continuous build for version 0.2.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/Xt-EHR/xt-ehr-common/ and changes regularly. See the Directory of published versions

## Logical Model: EHDSSubstance - Detailed Descriptions

Draft as of 2026-02-05

Definitions for the EHDSSubstance logical model.

- Key Elements Table
- Differential Elements Table
- Snapshot Elements Table

Guidance on how to interpret the contents of this table can be foundhere

0. EHDSSubstance
Definition | EHDS refined base model for Substance Base definition for all types defined in FHIR type system.
Short | Substance modelBase for all types and resources
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSSubstance.identifier
Definition | Unique identifier for the substance. For an instance, an identifier associated with the package/container (usually a label affixed directly).
Short | Identifier
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..*
Type | Identifier
4. EHDSSubstance.code
Definition | A code (or set of codes) that identify this substance.
Short | Code
Control | 0..*
Binding | SNOMED CT
Type | CodeableConcept
6. EHDSSubstance.description
Definition | A description of the substance - its appearance, handling requirements, and other usage notes.
Short | Description
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. EHDSSubstance.expiry
Definition | When the substance is no longer valid to use.
Short | Expiry
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
10. EHDSSubstance.quantity
Definition | The amount of the substance.
Short | Quantity
Control | 0..1
Type | Quantity
12. EHDSSubstance.ingredients
Definition | Composition information about the substance
Short | Ingredients
Control | 0..*
Type | Base
14. EHDSSubstance.ingredients.quantity
Definition | The amount of the ingredient in the substance - a concentration ratio.
Short | Quantity
Control | 0..1
Type | Ratio
16. EHDSSubstance.ingredients.substance
Definition | Another substance that is a component of this substance.
Short | Substance
Control | 1..1
Type | Reference(Substance model)

Guidance on how to interpret the contents of this table can be foundhere

0. EHDSSubstance
Definition | EHDS refined base model for Substance
Short | Substance model
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSSubstance.identifier
Definition | Unique identifier for the substance. For an instance, an identifier associated with the package/container (usually a label affixed directly).
Short | Identifier
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..*
Type | Identifier
4. EHDSSubstance.code
Definition | A code (or set of codes) that identify this substance.
Short | Code
Control | 0..*
Binding | SNOMED CT
Type | CodeableConcept
6. EHDSSubstance.description
Definition | A description of the substance - its appearance, handling requirements, and other usage notes.
Short | Description
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. EHDSSubstance.expiry
Definition | When the substance is no longer valid to use.
Short | Expiry
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
10. EHDSSubstance.quantity
Definition | The amount of the substance.
Short | Quantity
Control | 0..1
Type | Quantity
12. EHDSSubstance.ingredients
Definition | Composition information about the substance
Short | Ingredients
Control | 0..*
Type | Base
14. EHDSSubstance.ingredients.quantity
Definition | The amount of the ingredient in the substance - a concentration ratio.
Short | Quantity
Control | 0..1
Type | Ratio
16. EHDSSubstance.ingredients.substance
Definition | Another substance that is a component of this substance.
Short | Substance
Control | 1..1
Type | Reference(Substance model)

Guidance on how to interpret the contents of this table can be foundhere

0. EHDSSubstance
Definition | EHDS refined base model for Substance
Short | Substance model
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSSubstance.identifier
Definition | Unique identifier for the substance. For an instance, an identifier associated with the package/container (usually a label affixed directly).
Short | Identifier
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..*
Type | Identifier
4. EHDSSubstance.code
Definition | A code (or set of codes) that identify this substance.
Short | Code
Control | 0..*
Binding | SNOMED CT
Type | CodeableConcept
6. EHDSSubstance.description
Definition | A description of the substance - its appearance, handling requirements, and other usage notes.
Short | Description
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. EHDSSubstance.expiry
Definition | When the substance is no longer valid to use.
Short | Expiry
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
10. EHDSSubstance.quantity
Definition | The amount of the substance.
Short | Quantity
Control | 0..1
Type | Quantity
12. EHDSSubstance.ingredients
Definition | Composition information about the substance
Short | Ingredients
Control | 0..*
Type | Base
14. EHDSSubstance.ingredients.quantity
Definition | The amount of the ingredient in the substance - a concentration ratio.
Short | Quantity
Control | 0..1
Type | Ratio
16. EHDSSubstance.ingredients.substance
Definition | Another substance that is a component of this substance.
Short | Substance
Control | 1..1
Type | Reference(Substance model)