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: Observation model

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

EHDS refined base model for Observation information

Usages:

- Derived from this Logical Model: Laboratory observation model
- Use this Logical Model: Device use model, Medication administration model, Observation model, Patient summary model... Show 2 more, Procedure model and Social history model
- Refer to this Logical Model: Encounter model, Episode of care model and Service request model

### Views of Logical Model

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

- Differential Table
- Snapshot Table

This structure is derived from EHDSDataSet

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
EHDSObservation |  | 0..* | EHDSDataSet | Elements defined in Ancestors:header, presentedForm Observation model Instances of this logical model can be the target of a Reference
header |  |  |  |
status |  | 1..1 | CodeableConcept | Status of the resource Binding Description: (preferred): HL7 Observation status
observationDate[x] |  | 1..1 |  | Clinically relevant time or time period for the observation
observationDateDateTime |  |  | dateTime |
observationDatePeriod |  |  | Period |
code |  | 1..1 | CodeableConcept | Observation code Binding Description: (preferred): LOINC, NPU, SNOMED CT
originalName |  | 0..1 | string | Original (conventional) name of the observation
method |  | 0..1 | CodeableConcept | Observation method Binding Description: (preferred): SNOMED CT
order |  | 0..1 | EHDSServiceRequest | Identifies order and order placer this observation belongs to
performer |  | 0..1 | EHDSHealthProfessional | Performer
anatomicLocation |  | 0..1 | EHDSBodyStructure | Anatomic location and laterality where the observation was performed.
result |  | 0..1 | Base | Result of the observation including text, numeric and coded results of the measurement and measurement uncertainty. Content of the observation result will vary according to the type of the observation.
value[x] |  | 1..1 |  | Observation result value according to the type of observation Binding Description: (preferred): UCUM for units, SNOMED CT for coded results
valueString |  |  | string |
valueQuantity |  |  | Quantity |
valueRange |  |  | Range |
valueCodeableConcept |  |  | CodeableConcept |
uncertainty |  | 0..1 | Base | Measurement uncertainty type and interval if needed.
dataAbsentReason |  | 0..1 | CodeableConcept | Provides a reason why the expected value in the element Observation.value[x] is missing. Binding Description: (preferred): HL7 Data absent reason
referenceRange |  | 0..* | Base | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
interpretation |  | 0..* | CodeableConcept | Information about reference intervals and result interpretation. Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
resultDescription |  | 0..1 | string | Comments and narrative representation of the observation result and findings.
component |  | 0..* | Base | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
result |  | 0..1 | Base | Result of the observation including text, numeric and coded results of the measurement and measurement uncertainty. Content of the observation result will vary according to the type of the observation.
value[x] |  | 1..1 |  | Observation result value according to the type of observation
valueString |  |  | string |
valueQuantity |  |  | Quantity |
valueRange |  |  | Range |
valueCodeableConcept |  |  | CodeableConcept |
uncertainty |  | 0..1 | Base | Measurement uncertainty type and interval if needed.
dataAbsentReason |  | 0..1 | CodeableConcept | Provides a reason why the expected value in the element Observation.value[x] is missing. Binding Description: (preferred): HL7 Data absent reason
referenceRange |  | 0..* | Base | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
interpretation |  | 0..* | CodeableConcept | Information about reference intervals and result interpretation. Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
derivedFrom[x] |  | 0..* |  | Reference to the related resource from which the observation has been made. For example, a calculated anion gap or a fetal measurement based on an ultrasound image.
derivedFromEHDSObservation |  |  | EHDSObservation |
derivedFromEHDSLaboratoryObservation |  |  | EHDSLaboratoryObservation |
derivedFromEHDSImagingStudy |  |  | EHDSImagingStudy |
triggeredBy[x] |  | 0..* |  | References to the observation(s) that triggered the performance of this observation.
triggeredByEHDSLaboratoryObservation |  |  | EHDSLaboratoryObservation |
triggeredByEHDSObservation |  |  | EHDSObservation |
hasMember[x] |  | 0..* |  | This observation is a group observation (e.g. a battery, a panel of tests, a set of vital sign measurements) that includes the target as a member of the group.
hasMemberEHDSLaboratoryObservation |  |  | EHDSLaboratoryObservation |
hasMemberEHDSObservation |  |  | EHDSObservation |
Documentation for this format

#### Terminology Bindings (Differential)

Path | Conformance | ValueSet | URI
EHDSObservation.header.status | preferred | ``
EHDSObservation.code | preferred |
EHDSObservation.method | preferred |
EHDSObservation.result.value[x] | preferred |
EHDSObservation.dataAbsentReason | preferred |
EHDSObservation.interpretation | preferred |
EHDSObservation.component.dataAbsentReason | preferred |
EHDSObservation.component.interpretation | preferred |

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
EHDSObservation |  | 0..* | EHDSDataSet | Elements defined in Ancestors:header, presentedForm Observation model Instances of this logical model can be the target of a Reference
header |  | 1..1 | Base | Common header for all patient-related data
subject |  | 1..1 | EHDSPatient | Subject
identifier |  | 0..* | Identifier | Business identifier for the object
authorship |  | 1..* | Base | Authorship
author[x] |  | 1..1 |  | Author
authorEHDSHealthProfessional |  |  | EHDSHealthProfessional |
authorEHDSOrganisation |  |  | EHDSOrganisation |
authorEHDSDevice |  |  | EHDSDevice |
datetime |  | 1..1 | dateTime | Date and time of authoring/issuing
lastUpdate |  | 0..1 | dateTime | Date and time of the last update to the resource
status |  | 1..1 | CodeableConcept | Status of the resource Binding Description: (preferred): HL7 Observation status
statusReason[x] |  | 0..1 |  | Reason for the current status of the resource.
statusReasonCodeableConcept |  |  | CodeableConcept |
statusReasonString |  |  | string |
language |  | 0..1 | CodeableConcept | Language Binding Description: (preferred): BCP 47
version |  | 0..1 | string | Version
presentedForm |  | 0..* | EHDSAttachment | A narrative easy-to-read representation of the full data set, e.g. PDF-version of a document
observationDate[x] |  | 1..1 |  | Clinically relevant time or time period for the observation
observationDateDateTime |  |  | dateTime |
observationDatePeriod |  |  | Period |
code |  | 1..1 | CodeableConcept | Observation code Binding Description: (preferred): LOINC, NPU, SNOMED CT
originalName |  | 0..1 | string | Original (conventional) name of the observation
method |  | 0..1 | CodeableConcept | Observation method Binding Description: (preferred): SNOMED CT
order |  | 0..1 | EHDSServiceRequest | Identifies order and order placer this observation belongs to
performer |  | 0..1 | EHDSHealthProfessional | Performer
anatomicLocation |  | 0..1 | EHDSBodyStructure | Anatomic location and laterality where the observation was performed.
result |  | 0..1 | Base | Result of the observation including text, numeric and coded results of the measurement and measurement uncertainty. Content of the observation result will vary according to the type of the observation.
value[x] |  | 1..1 |  | Observation result value according to the type of observation Binding Description: (preferred): UCUM for units, SNOMED CT for coded results
valueString |  |  | string |
valueQuantity |  |  | Quantity |
valueRange |  |  | Range |
valueCodeableConcept |  |  | CodeableConcept |
uncertainty |  | 0..1 | Base | Measurement uncertainty type and interval if needed.
dataAbsentReason |  | 0..1 | CodeableConcept | Provides a reason why the expected value in the element Observation.value[x] is missing. Binding Description: (preferred): HL7 Data absent reason
referenceRange |  | 0..* | Base | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
interpretation |  | 0..* | CodeableConcept | Information about reference intervals and result interpretation. Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
resultDescription |  | 0..1 | string | Comments and narrative representation of the observation result and findings.
component |  | 0..* | Base | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
result |  | 0..1 | Base | Result of the observation including text, numeric and coded results of the measurement and measurement uncertainty. Content of the observation result will vary according to the type of the observation.
value[x] |  | 1..1 |  | Observation result value according to the type of observation
valueString |  |  | string |
valueQuantity |  |  | Quantity |
valueRange |  |  | Range |
valueCodeableConcept |  |  | CodeableConcept |
uncertainty |  | 0..1 | Base | Measurement uncertainty type and interval if needed.
dataAbsentReason |  | 0..1 | CodeableConcept | Provides a reason why the expected value in the element Observation.value[x] is missing. Binding Description: (preferred): HL7 Data absent reason
referenceRange |  | 0..* | Base | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
interpretation |  | 0..* | CodeableConcept | Information about reference intervals and result interpretation. Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
derivedFrom[x] |  | 0..* |  | Reference to the related resource from which the observation has been made. For example, a calculated anion gap or a fetal measurement based on an ultrasound image.
derivedFromEHDSObservation |  |  | EHDSObservation |
derivedFromEHDSLaboratoryObservation |  |  | EHDSLaboratoryObservation |
derivedFromEHDSImagingStudy |  |  | EHDSImagingStudy |
triggeredBy[x] |  | 0..* |  | References to the observation(s) that triggered the performance of this observation.
triggeredByEHDSLaboratoryObservation |  |  | EHDSLaboratoryObservation |
triggeredByEHDSObservation |  |  | EHDSObservation |
hasMember[x] |  | 0..* |  | This observation is a group observation (e.g. a battery, a panel of tests, a set of vital sign measurements) that includes the target as a member of the group.
hasMemberEHDSLaboratoryObservation |  |  | EHDSLaboratoryObservation |
hasMemberEHDSObservation |  |  | EHDSObservation |
Documentation for this format

#### Terminology Bindings

Path | Conformance | ValueSet | URI
EHDSObservation.header.status | preferred |
EHDSObservation.header.language | preferred |
EHDSObservation.code | preferred |
EHDSObservation.method | preferred |
EHDSObservation.result.value[x] | preferred |
EHDSObservation.dataAbsentReason | preferred |
EHDSObservation.interpretation | preferred |
EHDSObservation.component.dataAbsentReason | preferred |
EHDSObservation.component.interpretation | preferred |

Other representations of model: CSV, Excel