EHDS Logical Information Models
0.1.0 - ci-build

EHDS Logical Information Models, published by Xt-EHR. This guide is not an authorized publication; it is the continuous build for version 0.1.0 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/tree/stakeholder-consultation-D6-1 and changes regularly. See the Directory of published versions

## Logical Model: Substance model

Official URL: https://www.xt-ehr.eu/specifications/fhir/StructureDefinition/EHDSSubstance | Version: 0.1.0
Draft as of 2025-07-08 | Computable Name: EHDSSubstance

C.28 - EHDS refined base model for Substance

Usages:

- Refer to this Logical Model: Specimen model and Substance model

### Views of Logical Model

Description of Differentials, Snapshots and how the different presentations work.

- Differential Table
- Snapshot Table

This structure is derived from Base

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
EHDSSubstance |  | 0..* | Base | Substance model Instances of this logical model can be the target of a Reference
identifier |  | 0..* | Identifier | C.28.1 - Identifier
code |  | 0..* | CodeableConcept | C.28.2 - Code Binding Description: (preferred): SNOMED CT
description |  | 0..1 | string | C.28.3 - Description
expiry |  | 0..1 | dateTime | C.28.4 - Expiry
quantity |  | 0..1 | Quantity | C.28.5 - Quantity
ingredients |  | 0..* | Base | C.28.6 - Ingredients
quantity |  | 0..1 | Ratio | C.28.6.1 - Quantity
substance |  | 1..1 | Reference(Substance model) | C.28.6.2 - Substance
Documentation for this format

#### Terminology Bindings (Differential)

Path | Conformance | ValueSet | URI
EHDSSubstance.code | preferred |

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
EHDSSubstance |  | 0..* | Base | Substance model Instances of this logical model can be the target of a Reference
identifier |  | 0..* | Identifier | C.28.1 - Identifier
code |  | 0..* | CodeableConcept | C.28.2 - Code Binding Description: (preferred): SNOMED CT
description |  | 0..1 | string | C.28.3 - Description
expiry |  | 0..1 | dateTime | C.28.4 - Expiry
quantity |  | 0..1 | Quantity | C.28.5 - Quantity
ingredients |  | 0..* | Base | C.28.6 - Ingredients
quantity |  | 0..1 | Ratio | C.28.6.1 - Quantity
substance |  | 1..1 | Reference(Substance model) | C.28.6.2 - Substance
Documentation for this format

#### Terminology Bindings

Path | Conformance | ValueSet | URI
EHDSSubstance.code | preferred |

Other representations of model: CSV, Excel