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/costateixeira/xt-ehr-common/ and changes regularly. See the Directory of published versions

## Logical Model: EHDSObservationCore - Detailed Descriptions

Draft as of 2025-12-03

Definitions for the EHDSObservationCore 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. EHDSObservationCore
Definition | EHDS refined base model for Observation information Base definition for all types defined in FHIR type system.
Short | Observation 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. EHDSObservationCore.header
Definition | Common header for all patient-related data
Short | Common header for all patient-related data
Control | 1..1
Type | Base
4. EHDSObservationCore.header.subject
Definition | Patient/subject information
Short | Patient/subject information
Control | 1..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient
6. EHDSObservationCore.header.identifier
Definition | Business identifier for the object
Short | Business identifier for the object
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..*
Type | Identifier
8. EHDSObservationCore.header.authorship
Definition | Resource authoring details
Short | Resource authoring details
Control | 1..*
Type | Base
10. EHDSObservationCore.header.authorship.author[x]
Definition | Author(s) by whom the resource was/were authored. Multiple authors could be provided.
Short | Author(s) by whom the resource was/were authored. Multiple authors could be provided.
Control | 1..1
Type | Choice of: http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSHealthProfessional, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSOrganisation, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSDevice
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
12. EHDSObservationCore.header.authorship.datetime
Definition | Date and time of authoring/issuing
Short | Date and time of authoring/issuing
Control | 1..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
14. EHDSObservationCore.header.lastUpdate
Definition | Date and time of the last update to the resource (may be used for technical corrections).
Short | Date and time of the last update to the resource (may be used for technical corrections).
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
16. EHDSObservationCore.header.status
Definition | Status of the resource or document
Short | Status of the resource or document
Control | 1..1
Type | CodeableConcept
18. EHDSObservationCore.header.statusReason[x]
Definition | Reason for the current status of the resource.
Short | Reason for the current status of the resource.
Control | 0..1
Type | Choice of: CodeableConcept, string
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
20. EHDSObservationCore.header.language
Definition | Language in which the resource is written. Language is expressed by the IETF language tag.
Short | Language in which the resource is written. Language is expressed by the IETF language tag.
Control | 0..1
Binding | BCP 47
Type | CodeableConcept
22. EHDSObservationCore.observationDate[x]
Definition | Clinically relevant time or time period for the observation
Short | Clinically relevant time or time period for the observation
Control | 1..1
Type | Choice of: dateTime, Period
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
24. EHDSObservationCore.code
Definition | Code representing the observation using the agreed code systems.
Short | Observation code
Control | 1..1
Binding | LOINC, NPU, SNOMED CT
Type | CodeableConcept
26. EHDSObservationCore.resultDescription
Definition | Comments and narrative representation of the observation result and findings.
Short | Comments and narrative representation of the observation result and findings.
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
28. EHDSObservationCore.result
Definition | 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.
Short | 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.
Control | 0..1
Type | Base
30. EHDSObservationCore.result.value[x]
Definition | Observation result value according to the type of observation
Short | Observation result value according to the type of observation
Control | 1..1
Binding | UCUM for units, SNOMED CT for coded results
Type | Choice of: string, Quantity, Range, CodeableConcept
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
32. EHDSObservationCore.anatomicLocation
Definition | Anatomic location and laterality where the observation was performed.
Short | Anatomic location and laterality where the observation was performed.
Control | 0..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
34. EHDSObservationCore.specimen
Definition | Specimen information
Short | Specimen information
Control | 0..*
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSSpecimenCore
36. EHDSObservationCore.method
Definition | Observation method (measurement principle) to obtain the result.
Short | Observation method
Control | 0..1
Binding | SNOMED CT
Type | CodeableConcept
38. EHDSObservationCore.performer[x]
Definition | Performer of the observation. Some test could be performed by the patient himself or by a care giver. Those are in the scope of this deliverable under specified conditions.
Short | Performer of the observation. Some test could be performed by the patient himself or by a care giver. Those are in the scope of this deliverable under specified conditions.
Control | 0..1
Type | Choice of: http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSHealthProfessional, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSRelatedPerson
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
40. EHDSObservationCore.referenceRange
Definition | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Short | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Comments | Reference ranges are usually implied only for a numeric scale type. Use of the same units for reference range and value is implied.
Control | 0..*
Type | Base
42. EHDSObservationCore.interpretation
Definition | Information about reference intervals and result interpretation.
Short | Information about reference intervals and result interpretation.
Control | 0..*
Binding | SNOMED CT, HL7 ObservationInterpretation
Type | CodeableConcept
44. EHDSObservationCore.component
Definition | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
Short | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
Control | 0..*
Type | Base
46. EHDSObservationCore.component.code
Definition | Code representing the observation using the agreed code systems.
Short | Code representing the observation using the agreed code systems.
Control | 1..1
Binding | LOINC, NPU, SNOMED CT
Type | CodeableConcept
48. EHDSObservationCore.component.result
Definition | 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.
Short | 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.
Control | 0..1
Type | Base
50. EHDSObservationCore.component.result.value[x]
Definition | Observation result value according to the type of observation
Short | Observation result value according to the type of observation
Control | 1..1
Type | Choice of: string, Quantity, Range, CodeableConcept
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
52. EHDSObservationCore.component.result.uncertainty
Definition | Measurement uncertainty type and interval if needed.
Short | Measurement uncertainty type and interval if needed.
Control | 0..1
Type | Base
54. EHDSObservationCore.component.referenceRange
Definition | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Short | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Comments | Reference ranges are usually implied only for a numeric scale type. Use of the same units for reference range and value is implied.
Control | 0..*
Type | Base
56. EHDSObservationCore.component.interpretation
Definition | Information about reference intervals and result interpretation.
Short | Information about reference intervals and result interpretation.
Control | 0..*
Binding | SNOMED CT, HL7 ObservationInterpretation
Type | CodeableConcept

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

0. EHDSObservationCore
Definition | EHDS refined base model for Observation information
Short | Observation model
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSObservationCore.observationDate[x]
Definition | Clinically relevant time or time period for the observation
Short | Clinically relevant time or time period for the observation
Control | 1..1
Type | Choice of: dateTime, Period
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
4. EHDSObservationCore.code
Definition | Code representing the observation using the agreed code systems.
Short | Observation code
Control | 1..1
Binding | LOINC, NPU, SNOMED CT
Type | CodeableConcept
6. EHDSObservationCore.resultDescription
Definition | Comments and narrative representation of the observation result and findings.
Short | Comments and narrative representation of the observation result and findings.
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. EHDSObservationCore.result
Definition | 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.
Short | 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.
Control | 0..1
Type | Base
10. EHDSObservationCore.result.value[x]
Definition | Observation result value according to the type of observation
Short | Observation result value according to the type of observation
Control | 1..1
Binding | UCUM for units, SNOMED CT for coded results
Type | Choice of: string, Quantity, Range, CodeableConcept
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
12. EHDSObservationCore.anatomicLocation
Definition | Anatomic location and laterality where the observation was performed.
Short | Anatomic location and laterality where the observation was performed.
Control | 0..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
14. EHDSObservationCore.specimen
Definition | Specimen information
Short | Specimen information
Control | 0..*
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSSpecimenCore
16. EHDSObservationCore.method
Definition | Observation method (measurement principle) to obtain the result.
Short | Observation method
Control | 0..1
Binding | SNOMED CT
Type | CodeableConcept
18. EHDSObservationCore.performer[x]
Definition | Performer of the observation. Some test could be performed by the patient himself or by a care giver. Those are in the scope of this deliverable under specified conditions.
Short | Performer of the observation. Some test could be performed by the patient himself or by a care giver. Those are in the scope of this deliverable under specified conditions.
Control | 0..1
Type | Choice of: http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSHealthProfessional, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSRelatedPerson
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
20. EHDSObservationCore.referenceRange
Definition | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Short | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Comments | Reference ranges are usually implied only for a numeric scale type. Use of the same units for reference range and value is implied.
Control | 0..*
Type | Base
22. EHDSObservationCore.interpretation
Definition | Information about reference intervals and result interpretation.
Short | Information about reference intervals and result interpretation.
Control | 0..*
Binding | SNOMED CT, HL7 ObservationInterpretation
Type | CodeableConcept
24. EHDSObservationCore.component
Definition | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
Short | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
Control | 0..*
Type | Base
26. EHDSObservationCore.component.code
Definition | Code representing the observation using the agreed code systems.
Short | Code representing the observation using the agreed code systems.
Control | 1..1
Binding | LOINC, NPU, SNOMED CT
Type | CodeableConcept
28. EHDSObservationCore.component.result
Definition | 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.
Short | 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.
Control | 0..1
Type | Base
30. EHDSObservationCore.component.result.value[x]
Definition | Observation result value according to the type of observation
Short | Observation result value according to the type of observation
Control | 1..1
Type | Choice of: string, Quantity, Range, CodeableConcept
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
32. EHDSObservationCore.component.result.uncertainty
Definition | Measurement uncertainty type and interval if needed.
Short | Measurement uncertainty type and interval if needed.
Control | 0..1
Type | Base
34. EHDSObservationCore.component.referenceRange
Definition | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Short | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Comments | Reference ranges are usually implied only for a numeric scale type. Use of the same units for reference range and value is implied.
Control | 0..*
Type | Base
36. EHDSObservationCore.component.interpretation
Definition | Information about reference intervals and result interpretation.
Short | Information about reference intervals and result interpretation.
Control | 0..*
Binding | SNOMED CT, HL7 ObservationInterpretation
Type | CodeableConcept

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

0. EHDSObservationCore
Definition | EHDS refined base model for Observation information
Short | Observation model
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSObservationCore.header
Definition | Common header for all patient-related data
Short | Common header for all patient-related data
Control | 1..1
Type | Base
4. EHDSObservationCore.header.subject
Definition | Patient/subject information
Short | Patient/subject information
Control | 1..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient
6. EHDSObservationCore.header.identifier
Definition | Business identifier for the object
Short | Business identifier for the object
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..*
Type | Identifier
8. EHDSObservationCore.header.authorship
Definition | Resource authoring details
Short | Resource authoring details
Control | 1..*
Type | Base
10. EHDSObservationCore.header.authorship.author[x]
Definition | Author(s) by whom the resource was/were authored. Multiple authors could be provided.
Short | Author(s) by whom the resource was/were authored. Multiple authors could be provided.
Control | 1..1
Type | Choice of: http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSHealthProfessional, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSOrganisation, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSDevice
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
12. EHDSObservationCore.header.authorship.datetime
Definition | Date and time of authoring/issuing
Short | Date and time of authoring/issuing
Control | 1..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
14. EHDSObservationCore.header.lastUpdate
Definition | Date and time of the last update to the resource (may be used for technical corrections).
Short | Date and time of the last update to the resource (may be used for technical corrections).
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
16. EHDSObservationCore.header.status
Definition | Status of the resource or document
Short | Status of the resource or document
Control | 1..1
Type | CodeableConcept
18. EHDSObservationCore.header.statusReason[x]
Definition | Reason for the current status of the resource.
Short | Reason for the current status of the resource.
Control | 0..1
Type | Choice of: CodeableConcept, string
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
20. EHDSObservationCore.header.language
Definition | Language in which the resource is written. Language is expressed by the IETF language tag.
Short | Language in which the resource is written. Language is expressed by the IETF language tag.
Control | 0..1
Binding | BCP 47
Type | CodeableConcept
22. EHDSObservationCore.observationDate[x]
Definition | Clinically relevant time or time period for the observation
Short | Clinically relevant time or time period for the observation
Control | 1..1
Type | Choice of: dateTime, Period
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
24. EHDSObservationCore.code
Definition | Code representing the observation using the agreed code systems.
Short | Observation code
Control | 1..1
Binding | LOINC, NPU, SNOMED CT
Type | CodeableConcept
26. EHDSObservationCore.resultDescription
Definition | Comments and narrative representation of the observation result and findings.
Short | Comments and narrative representation of the observation result and findings.
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
28. EHDSObservationCore.result
Definition | 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.
Short | 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.
Control | 0..1
Type | Base
30. EHDSObservationCore.result.value[x]
Definition | Observation result value according to the type of observation
Short | Observation result value according to the type of observation
Control | 1..1
Binding | UCUM for units, SNOMED CT for coded results
Type | Choice of: string, Quantity, Range, CodeableConcept
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
32. EHDSObservationCore.anatomicLocation
Definition | Anatomic location and laterality where the observation was performed.
Short | Anatomic location and laterality where the observation was performed.
Control | 0..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
34. EHDSObservationCore.specimen
Definition | Specimen information
Short | Specimen information
Control | 0..*
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSSpecimenCore
36. EHDSObservationCore.method
Definition | Observation method (measurement principle) to obtain the result.
Short | Observation method
Control | 0..1
Binding | SNOMED CT
Type | CodeableConcept
38. EHDSObservationCore.performer[x]
Definition | Performer of the observation. Some test could be performed by the patient himself or by a care giver. Those are in the scope of this deliverable under specified conditions.
Short | Performer of the observation. Some test could be performed by the patient himself or by a care giver. Those are in the scope of this deliverable under specified conditions.
Control | 0..1
Type | Choice of: http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSHealthProfessional, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSRelatedPerson
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
40. EHDSObservationCore.referenceRange
Definition | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Short | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Comments | Reference ranges are usually implied only for a numeric scale type. Use of the same units for reference range and value is implied.
Control | 0..*
Type | Base
42. EHDSObservationCore.interpretation
Definition | Information about reference intervals and result interpretation.
Short | Information about reference intervals and result interpretation.
Control | 0..*
Binding | SNOMED CT, HL7 ObservationInterpretation
Type | CodeableConcept
44. EHDSObservationCore.component
Definition | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
Short | Component in case the observation consists of multiple sub-observations (e.g. blood pressure).
Control | 0..*
Type | Base
46. EHDSObservationCore.component.code
Definition | Code representing the observation using the agreed code systems.
Short | Code representing the observation using the agreed code systems.
Control | 1..1
Binding | LOINC, NPU, SNOMED CT
Type | CodeableConcept
48. EHDSObservationCore.component.result
Definition | 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.
Short | 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.
Control | 0..1
Type | Base
50. EHDSObservationCore.component.result.value[x]
Definition | Observation result value according to the type of observation
Short | Observation result value according to the type of observation
Control | 1..1
Type | Choice of: string, Quantity, Range, CodeableConcept
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
52. EHDSObservationCore.component.result.uncertainty
Definition | Measurement uncertainty type and interval if needed.
Short | Measurement uncertainty type and interval if needed.
Control | 0..1
Type | Base
54. EHDSObservationCore.component.referenceRange
Definition | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Short | Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.
Comments | Reference ranges are usually implied only for a numeric scale type. Use of the same units for reference range and value is implied.
Control | 0..*
Type | Base
56. EHDSObservationCore.component.interpretation
Definition | Information about reference intervals and result interpretation.
Short | Information about reference intervals and result interpretation.
Control | 0..*
Binding | SNOMED CT, HL7 ObservationInterpretation
Type | CodeableConcept