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.

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.

ShortObservation modelBase for all types and resources
Control0..*
Is Modifierfalse
Logical ModelInstances 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

ShortCommon header for all patient-related data
Control1..1
TypeBase
4. EHDSObservationCore.header.subject
Definition

Patient/subject information

ShortPatient/subject information
Control1..1
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient
6. EHDSObservationCore.header.identifier
Definition

Business identifier for the object

ShortBusiness identifier for the object
NoteThis is a business identifier, not a resource identifier (see discussion)
Control0..*
TypeIdentifier
8. EHDSObservationCore.header.authorship
Definition

Resource authoring details

ShortResource authoring details
Control1..*
TypeBase
10. EHDSObservationCore.header.authorship.author[x]
Definition

Author(s) by whom the resource was/were authored. Multiple authors could be provided.

ShortAuthor(s) by whom the resource was/were authored. Multiple authors could be provided.
Control1..1
TypeChoice 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] NoteSeeChoice of Data Typesfor further information about how to use [x]
12. EHDSObservationCore.header.authorship.datetime
Definition

Date and time of authoring/issuing

ShortDate and time of authoring/issuing
Control1..1
TypedateTime
Primitive ValueThis 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).

ShortDate and time of the last update to the resource (may be used for technical corrections).
Control0..1
TypedateTime
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
16. EHDSObservationCore.header.status
Definition

Status of the resource or document

ShortStatus of the resource or document
Control1..1
TypeCodeableConcept
18. EHDSObservationCore.header.statusReason[x]
Definition

Reason for the current status of the resource.

ShortReason for the current status of the resource.
Control0..1
TypeChoice of: CodeableConcept, string
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortLanguage in which the resource is written. Language is expressed by the IETF language tag.
Control0..1
Binding

BCP 47

TypeCodeableConcept
22. EHDSObservationCore.observationDate[x]
Definition

Clinically relevant time or time period for the observation

ShortClinically relevant time or time period for the observation
Control1..1
TypeChoice of: dateTime, Period
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortObservation code
Control1..1
Binding

LOINC, NPU, SNOMED CT

TypeCodeableConcept
26. EHDSObservationCore.resultDescription
Definition

Comments and narrative representation of the observation result and findings.

ShortComments and narrative representation of the observation result and findings.
Control0..1
Typestring
Primitive ValueThis 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.

ShortResult 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.
Control0..1
TypeBase
30. EHDSObservationCore.result.value[x]
Definition

Observation result value according to the type of observation

ShortObservation result value according to the type of observation
Control1..1
Binding

UCUM for units, SNOMED CT for coded results

TypeChoice of: string, Quantity, Range, CodeableConcept
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortAnatomic location and laterality where the observation was performed.
Control0..1
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
34. EHDSObservationCore.specimen
Definition

Specimen information

ShortSpecimen information
Control0..*
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSSpecimenCore
36. EHDSObservationCore.method
Definition

Observation method (measurement principle) to obtain the result.

ShortObservation method
Control0..1
Binding

SNOMED CT

TypeCodeableConcept
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.

ShortPerformer 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.
Control0..1
TypeChoice 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] NoteSeeChoice 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.

ShortReference 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.

Control0..*
TypeBase
42. EHDSObservationCore.interpretation
Definition

Information about reference intervals and result interpretation.

ShortInformation about reference intervals and result interpretation.
Control0..*
Binding

SNOMED CT, HL7 ObservationInterpretation

TypeCodeableConcept
44. EHDSObservationCore.component
Definition

Component in case the observation consists of multiple sub-observations (e.g. blood pressure).

ShortComponent in case the observation consists of multiple sub-observations (e.g. blood pressure).
Control0..*
TypeBase
46. EHDSObservationCore.component.code
Definition

Code representing the observation using the agreed code systems.

ShortCode representing the observation using the agreed code systems.
Control1..1
Binding

LOINC, NPU, SNOMED CT

TypeCodeableConcept
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.

ShortResult 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.
Control0..1
TypeBase
50. EHDSObservationCore.component.result.value[x]
Definition

Observation result value according to the type of observation

ShortObservation result value according to the type of observation
Control1..1
TypeChoice of: string, Quantity, Range, CodeableConcept
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortMeasurement uncertainty type and interval if needed.
Control0..1
TypeBase
54. EHDSObservationCore.component.referenceRange
Definition

Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.

ShortReference 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.

Control0..*
TypeBase
56. EHDSObservationCore.component.interpretation
Definition

Information about reference intervals and result interpretation.

ShortInformation about reference intervals and result interpretation.
Control0..*
Binding

SNOMED CT, HL7 ObservationInterpretation

TypeCodeableConcept

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

0. EHDSObservationCore
Definition

EHDS refined base model for Observation information

ShortObservation model
Logical ModelInstances 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

ShortClinically relevant time or time period for the observation
Control1..1
TypeChoice of: dateTime, Period
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortObservation code
Control1..1
Binding

LOINC, NPU, SNOMED CT

TypeCodeableConcept
6. EHDSObservationCore.resultDescription
Definition

Comments and narrative representation of the observation result and findings.

ShortComments and narrative representation of the observation result and findings.
Control0..1
Typestring
Primitive ValueThis 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.

ShortResult 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.
Control0..1
TypeBase
10. EHDSObservationCore.result.value[x]
Definition

Observation result value according to the type of observation

ShortObservation result value according to the type of observation
Control1..1
Binding

UCUM for units, SNOMED CT for coded results

TypeChoice of: string, Quantity, Range, CodeableConcept
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortAnatomic location and laterality where the observation was performed.
Control0..1
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
14. EHDSObservationCore.specimen
Definition

Specimen information

ShortSpecimen information
Control0..*
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSSpecimenCore
16. EHDSObservationCore.method
Definition

Observation method (measurement principle) to obtain the result.

ShortObservation method
Control0..1
Binding

SNOMED CT

TypeCodeableConcept
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.

ShortPerformer 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.
Control0..1
TypeChoice 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] NoteSeeChoice 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.

ShortReference 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.

Control0..*
TypeBase
22. EHDSObservationCore.interpretation
Definition

Information about reference intervals and result interpretation.

ShortInformation about reference intervals and result interpretation.
Control0..*
Binding

SNOMED CT, HL7 ObservationInterpretation

TypeCodeableConcept
24. EHDSObservationCore.component
Definition

Component in case the observation consists of multiple sub-observations (e.g. blood pressure).

ShortComponent in case the observation consists of multiple sub-observations (e.g. blood pressure).
Control0..*
TypeBase
26. EHDSObservationCore.component.code
Definition

Code representing the observation using the agreed code systems.

ShortCode representing the observation using the agreed code systems.
Control1..1
Binding

LOINC, NPU, SNOMED CT

TypeCodeableConcept
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.

ShortResult 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.
Control0..1
TypeBase
30. EHDSObservationCore.component.result.value[x]
Definition

Observation result value according to the type of observation

ShortObservation result value according to the type of observation
Control1..1
TypeChoice of: string, Quantity, Range, CodeableConcept
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortMeasurement uncertainty type and interval if needed.
Control0..1
TypeBase
34. EHDSObservationCore.component.referenceRange
Definition

Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.

ShortReference 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.

Control0..*
TypeBase
36. EHDSObservationCore.component.interpretation
Definition

Information about reference intervals and result interpretation.

ShortInformation about reference intervals and result interpretation.
Control0..*
Binding

SNOMED CT, HL7 ObservationInterpretation

TypeCodeableConcept

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

0. EHDSObservationCore
Definition

EHDS refined base model for Observation information

ShortObservation model
Control0..*
Is Modifierfalse
Logical ModelInstances 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

ShortCommon header for all patient-related data
Control1..1
TypeBase
4. EHDSObservationCore.header.subject
Definition

Patient/subject information

ShortPatient/subject information
Control1..1
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient
6. EHDSObservationCore.header.identifier
Definition

Business identifier for the object

ShortBusiness identifier for the object
NoteThis is a business identifier, not a resource identifier (see discussion)
Control0..*
TypeIdentifier
8. EHDSObservationCore.header.authorship
Definition

Resource authoring details

ShortResource authoring details
Control1..*
TypeBase
10. EHDSObservationCore.header.authorship.author[x]
Definition

Author(s) by whom the resource was/were authored. Multiple authors could be provided.

ShortAuthor(s) by whom the resource was/were authored. Multiple authors could be provided.
Control1..1
TypeChoice 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] NoteSeeChoice of Data Typesfor further information about how to use [x]
12. EHDSObservationCore.header.authorship.datetime
Definition

Date and time of authoring/issuing

ShortDate and time of authoring/issuing
Control1..1
TypedateTime
Primitive ValueThis 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).

ShortDate and time of the last update to the resource (may be used for technical corrections).
Control0..1
TypedateTime
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
16. EHDSObservationCore.header.status
Definition

Status of the resource or document

ShortStatus of the resource or document
Control1..1
TypeCodeableConcept
18. EHDSObservationCore.header.statusReason[x]
Definition

Reason for the current status of the resource.

ShortReason for the current status of the resource.
Control0..1
TypeChoice of: CodeableConcept, string
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortLanguage in which the resource is written. Language is expressed by the IETF language tag.
Control0..1
Binding

BCP 47

TypeCodeableConcept
22. EHDSObservationCore.observationDate[x]
Definition

Clinically relevant time or time period for the observation

ShortClinically relevant time or time period for the observation
Control1..1
TypeChoice of: dateTime, Period
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortObservation code
Control1..1
Binding

LOINC, NPU, SNOMED CT

TypeCodeableConcept
26. EHDSObservationCore.resultDescription
Definition

Comments and narrative representation of the observation result and findings.

ShortComments and narrative representation of the observation result and findings.
Control0..1
Typestring
Primitive ValueThis 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.

ShortResult 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.
Control0..1
TypeBase
30. EHDSObservationCore.result.value[x]
Definition

Observation result value according to the type of observation

ShortObservation result value according to the type of observation
Control1..1
Binding

UCUM for units, SNOMED CT for coded results

TypeChoice of: string, Quantity, Range, CodeableConcept
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortAnatomic location and laterality where the observation was performed.
Control0..1
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
34. EHDSObservationCore.specimen
Definition

Specimen information

ShortSpecimen information
Control0..*
Typehttp://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSSpecimenCore
36. EHDSObservationCore.method
Definition

Observation method (measurement principle) to obtain the result.

ShortObservation method
Control0..1
Binding

SNOMED CT

TypeCodeableConcept
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.

ShortPerformer 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.
Control0..1
TypeChoice 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] NoteSeeChoice 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.

ShortReference 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.

Control0..*
TypeBase
42. EHDSObservationCore.interpretation
Definition

Information about reference intervals and result interpretation.

ShortInformation about reference intervals and result interpretation.
Control0..*
Binding

SNOMED CT, HL7 ObservationInterpretation

TypeCodeableConcept
44. EHDSObservationCore.component
Definition

Component in case the observation consists of multiple sub-observations (e.g. blood pressure).

ShortComponent in case the observation consists of multiple sub-observations (e.g. blood pressure).
Control0..*
TypeBase
46. EHDSObservationCore.component.code
Definition

Code representing the observation using the agreed code systems.

ShortCode representing the observation using the agreed code systems.
Control1..1
Binding

LOINC, NPU, SNOMED CT

TypeCodeableConcept
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.

ShortResult 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.
Control0..1
TypeBase
50. EHDSObservationCore.component.result.value[x]
Definition

Observation result value according to the type of observation

ShortObservation result value according to the type of observation
Control1..1
TypeChoice of: string, Quantity, Range, CodeableConcept
[x] NoteSeeChoice of Data Typesfor further information about how to use [x]
Primitive ValueThis 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.

ShortMeasurement uncertainty type and interval if needed.
Control0..1
TypeBase
54. EHDSObservationCore.component.referenceRange
Definition

Reference range, multiple reference ranges of different types culd by provided. Provides guide for interpretation of result.

ShortReference 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.

Control0..*
TypeBase
56. EHDSObservationCore.component.interpretation
Definition

Information about reference intervals and result interpretation.

ShortInformation about reference intervals and result interpretation.
Control0..*
Binding

SNOMED CT, HL7 ObservationInterpretation

TypeCodeableConcept