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/main and changes regularly. See the Directory of published versions

Logical Model: Laboratory observation model

Official URL: https://www.xt-ehr.eu/specifications/fhir/StructureDefinition/EHDSLaboratoryObservation Version: 0.1.0
Draft as of 2025-06-10 Computable Name: EHDSLaboratoryObservation

C.11 - EHDS refined base model for Observation performed by laboratory

Usages:

Formal Views of Profile Content

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

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. EHDSLaboratoryObservation 0..* EHDSObservation
Elements defined in Ancestors:observationDate[x], observationCode, observationName, observationOriginalName, observationMethod, observationDevice, order, performer, reporter, observationResult, dataAbsentReason, referenceRange, observationInterpretation, triggeredBy, hasMember, resultDescription, anatomicLocation, subject, component, status, derivedFrom
Laboratory observation model
Instances of this logical model can be the target of a Reference
... observationDate[x] 1..1 C.10.1 - Observation date
.... observationDateDateTime dateTime
.... observationDatePeriod Period
... observationCode 1..1 CodeableConcept C.10.2 - Observation code
Binding Description: (preferred): LOINC, NPU
... observationName 1..1 string C.10.3 - Observation name
... observationMethod 0..1 CodeableConcept C.10.5 - Observation method
Binding Description: (preferred): SNOMED CT
... observationDevice 0..1 EHDSDevice C.10.6 - Observation device
... order 0..1 Reference(Service request model) C.10.7 - Order
... performer 0..1 EHDSHealthProfessional C.10.8 - Performer
... reporter 0..1 EHDSHealthProfessional C.10.9 - Reporter
... observationResult 1..1 Base C.10.10 - Observation result
.... textualResult 0..1 string C.10.10.1 - Textual Result
.... numericResult 0..1 Base C.10.10.2 - Numeric Result
..... numericValue[x] 0..1 C.10.10.2.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.10.2.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.10.2.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.10.3 - Coded Result
Binding Description: (preferred): SNOMED CT
... dataAbsentReason 0..1 CodeableConcept C.10.11 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
... referenceRange 0..* Base C.10.12 - Reference range
... observationInterpretation 0..* CodeableConcept C.10.13 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... triggeredBy 0..* Reference(Laboratory observation model | Observation model) C.10.14 - Triggered by
... hasMember 0..* Reference(Laboratory observation model | Observation model) C.10.15 - Has member
... resultDescription 0..1 string C.10.16 - Result description
... anatomicLocation 0..1 CodeableConcept C.10.17 - Anatomic location
Binding Description: (preferred): SNOMED CT
... subject 1..1 Reference(Patient model | Location model | Device model | Organization model | Health professional model | Procedure model) C.10.18 - Subject
... component 0..* Base C.10.19 - Component
.... code 1..1 CodeableConcept C.10.19.1 - Code
Binding Description: (preferred): LOINC, NPU, SNOMED CT
.... textualResult 0..1 string C.10.19.2 - Textual Result
.... numericResult 0..1 Base C.10.19.3 - Numeric Result
..... numericValue[x] 0..1 C.10.19.3.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.19.3.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.19.3.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.19.4 - Coded Result
Binding Description: (preferred): SNOMED CT
.... dataAbsentReason 0..1 CodeableConcept C.10.19.5 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
.... referenceRange 0..* Base C.10.19.6 - Reference range
.... observationInterpretation 0..* CodeableConcept C.10.19.7 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... status 1..1 CodeableConcept C.10.20 - Status
Binding Description: (preferred): HL7 Observation status
... derivedFrom 0..* Reference(Observation model | Laboratory observation model | Imaging study model) C.10.21 - Derived from
... testKit 0..1 EHDSDevice C.11.2 - Test kit
... calibrator 0..1 Identifier C.11.3 - Calibrator
... accreditationStatus 0..1 CodeableConcept C.11.4 - Accreditation status
Binding Description: (preferred): Code system to be specified
... previousResults 0..* EHDSLaboratoryObservation C.11.5 - Previous results

doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
EHDSLaboratoryObservation.observationCodepreferred
EHDSLaboratoryObservation.observationMethodpreferred
EHDSLaboratoryObservation.observationResult.numericResult.unitspreferred
EHDSLaboratoryObservation.observationResult.codedResultpreferred
EHDSLaboratoryObservation.dataAbsentReasonpreferred
EHDSLaboratoryObservation.observationInterpretationpreferred
EHDSLaboratoryObservation.anatomicLocationpreferred
EHDSLaboratoryObservation.component.codepreferred
EHDSLaboratoryObservation.component.numericResult.unitspreferred
EHDSLaboratoryObservation.component.codedResultpreferred
EHDSLaboratoryObservation.component.dataAbsentReasonpreferred
EHDSLaboratoryObservation.component.observationInterpretationpreferred
EHDSLaboratoryObservation.statuspreferred
EHDSLaboratoryObservation.accreditationStatuspreferred

This structure is derived from EHDSObservation

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. EHDSLaboratoryObservation 0..* EHDSObservation
Elements defined in Ancestors:observationDate[x], observationCode, observationName, observationOriginalName, observationMethod, observationDevice, order, performer, reporter, observationResult, dataAbsentReason, referenceRange, observationInterpretation, triggeredBy, hasMember, resultDescription, anatomicLocation, subject, component, status, derivedFrom
Laboratory observation model
Instances of this logical model can be the target of a Reference
... observationCode 1..1 CodeableConcept C.10.2 - Observation code
Binding Description: (preferred): LOINC, NPU
... testKit 0..1 EHDSDevice C.11.2 - Test kit
... calibrator 0..1 Identifier C.11.3 - Calibrator
... previousResults 0..* EHDSLaboratoryObservation C.11.5 - Previous results

doco Documentation for this format

Terminology Bindings (Differential)

PathConformanceValueSetURI
EHDSLaboratoryObservation.observationCodepreferred
EHDSLaboratoryObservation.accreditationStatuspreferred
NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. EHDSLaboratoryObservation 0..* EHDSObservation
Elements defined in Ancestors:observationDate[x], observationCode, observationName, observationOriginalName, observationMethod, observationDevice, order, performer, reporter, observationResult, dataAbsentReason, referenceRange, observationInterpretation, triggeredBy, hasMember, resultDescription, anatomicLocation, subject, component, status, derivedFrom
Laboratory observation model
Instances of this logical model can be the target of a Reference
... observationDate[x] 1..1 C.10.1 - Observation date
.... observationDateDateTime dateTime
.... observationDatePeriod Period
... observationCode 1..1 CodeableConcept C.10.2 - Observation code
Binding Description: (preferred): LOINC, NPU
... observationName 1..1 string C.10.3 - Observation name
... observationMethod 0..1 CodeableConcept C.10.5 - Observation method
Binding Description: (preferred): SNOMED CT
... observationDevice 0..1 EHDSDevice C.10.6 - Observation device
... order 0..1 Reference(Service request model) C.10.7 - Order
... performer 0..1 EHDSHealthProfessional C.10.8 - Performer
... reporter 0..1 EHDSHealthProfessional C.10.9 - Reporter
... observationResult 1..1 Base C.10.10 - Observation result
.... textualResult 0..1 string C.10.10.1 - Textual Result
.... numericResult 0..1 Base C.10.10.2 - Numeric Result
..... numericValue[x] 0..1 C.10.10.2.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.10.2.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.10.2.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.10.3 - Coded Result
Binding Description: (preferred): SNOMED CT
... dataAbsentReason 0..1 CodeableConcept C.10.11 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
... referenceRange 0..* Base C.10.12 - Reference range
... observationInterpretation 0..* CodeableConcept C.10.13 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... triggeredBy 0..* Reference(Laboratory observation model | Observation model) C.10.14 - Triggered by
... hasMember 0..* Reference(Laboratory observation model | Observation model) C.10.15 - Has member
... resultDescription 0..1 string C.10.16 - Result description
... anatomicLocation 0..1 CodeableConcept C.10.17 - Anatomic location
Binding Description: (preferred): SNOMED CT
... subject 1..1 Reference(Patient model | Location model | Device model | Organization model | Health professional model | Procedure model) C.10.18 - Subject
... component 0..* Base C.10.19 - Component
.... code 1..1 CodeableConcept C.10.19.1 - Code
Binding Description: (preferred): LOINC, NPU, SNOMED CT
.... textualResult 0..1 string C.10.19.2 - Textual Result
.... numericResult 0..1 Base C.10.19.3 - Numeric Result
..... numericValue[x] 0..1 C.10.19.3.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.19.3.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.19.3.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.19.4 - Coded Result
Binding Description: (preferred): SNOMED CT
.... dataAbsentReason 0..1 CodeableConcept C.10.19.5 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
.... referenceRange 0..* Base C.10.19.6 - Reference range
.... observationInterpretation 0..* CodeableConcept C.10.19.7 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... status 1..1 CodeableConcept C.10.20 - Status
Binding Description: (preferred): HL7 Observation status
... derivedFrom 0..* Reference(Observation model | Laboratory observation model | Imaging study model) C.10.21 - Derived from
... testKit 0..1 EHDSDevice C.11.2 - Test kit
... calibrator 0..1 Identifier C.11.3 - Calibrator
... accreditationStatus 0..1 CodeableConcept C.11.4 - Accreditation status
Binding Description: (preferred): Code system to be specified
... previousResults 0..* EHDSLaboratoryObservation C.11.5 - Previous results

doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
EHDSLaboratoryObservation.observationCodepreferred
EHDSLaboratoryObservation.observationMethodpreferred
EHDSLaboratoryObservation.observationResult.numericResult.unitspreferred
EHDSLaboratoryObservation.observationResult.codedResultpreferred
EHDSLaboratoryObservation.dataAbsentReasonpreferred
EHDSLaboratoryObservation.observationInterpretationpreferred
EHDSLaboratoryObservation.anatomicLocationpreferred
EHDSLaboratoryObservation.component.codepreferred
EHDSLaboratoryObservation.component.numericResult.unitspreferred
EHDSLaboratoryObservation.component.codedResultpreferred
EHDSLaboratoryObservation.component.dataAbsentReasonpreferred
EHDSLaboratoryObservation.component.observationInterpretationpreferred
EHDSLaboratoryObservation.statuspreferred
EHDSLaboratoryObservation.accreditationStatuspreferred

This structure is derived from EHDSObservation

Summary

Key Elements View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. EHDSLaboratoryObservation 0..* EHDSObservation
Elements defined in Ancestors:observationDate[x], observationCode, observationName, observationOriginalName, observationMethod, observationDevice, order, performer, reporter, observationResult, dataAbsentReason, referenceRange, observationInterpretation, triggeredBy, hasMember, resultDescription, anatomicLocation, subject, component, status, derivedFrom
Laboratory observation model
Instances of this logical model can be the target of a Reference
... observationDate[x] 1..1 C.10.1 - Observation date
.... observationDateDateTime dateTime
.... observationDatePeriod Period
... observationCode 1..1 CodeableConcept C.10.2 - Observation code
Binding Description: (preferred): LOINC, NPU
... observationName 1..1 string C.10.3 - Observation name
... observationMethod 0..1 CodeableConcept C.10.5 - Observation method
Binding Description: (preferred): SNOMED CT
... observationDevice 0..1 EHDSDevice C.10.6 - Observation device
... order 0..1 Reference(Service request model) C.10.7 - Order
... performer 0..1 EHDSHealthProfessional C.10.8 - Performer
... reporter 0..1 EHDSHealthProfessional C.10.9 - Reporter
... observationResult 1..1 Base C.10.10 - Observation result
.... textualResult 0..1 string C.10.10.1 - Textual Result
.... numericResult 0..1 Base C.10.10.2 - Numeric Result
..... numericValue[x] 0..1 C.10.10.2.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.10.2.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.10.2.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.10.3 - Coded Result
Binding Description: (preferred): SNOMED CT
... dataAbsentReason 0..1 CodeableConcept C.10.11 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
... referenceRange 0..* Base C.10.12 - Reference range
... observationInterpretation 0..* CodeableConcept C.10.13 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... triggeredBy 0..* Reference(Laboratory observation model | Observation model) C.10.14 - Triggered by
... hasMember 0..* Reference(Laboratory observation model | Observation model) C.10.15 - Has member
... resultDescription 0..1 string C.10.16 - Result description
... anatomicLocation 0..1 CodeableConcept C.10.17 - Anatomic location
Binding Description: (preferred): SNOMED CT
... subject 1..1 Reference(Patient model | Location model | Device model | Organization model | Health professional model | Procedure model) C.10.18 - Subject
... component 0..* Base C.10.19 - Component
.... code 1..1 CodeableConcept C.10.19.1 - Code
Binding Description: (preferred): LOINC, NPU, SNOMED CT
.... textualResult 0..1 string C.10.19.2 - Textual Result
.... numericResult 0..1 Base C.10.19.3 - Numeric Result
..... numericValue[x] 0..1 C.10.19.3.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.19.3.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.19.3.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.19.4 - Coded Result
Binding Description: (preferred): SNOMED CT
.... dataAbsentReason 0..1 CodeableConcept C.10.19.5 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
.... referenceRange 0..* Base C.10.19.6 - Reference range
.... observationInterpretation 0..* CodeableConcept C.10.19.7 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... status 1..1 CodeableConcept C.10.20 - Status
Binding Description: (preferred): HL7 Observation status
... derivedFrom 0..* Reference(Observation model | Laboratory observation model | Imaging study model) C.10.21 - Derived from
... testKit 0..1 EHDSDevice C.11.2 - Test kit
... calibrator 0..1 Identifier C.11.3 - Calibrator
... accreditationStatus 0..1 CodeableConcept C.11.4 - Accreditation status
Binding Description: (preferred): Code system to be specified
... previousResults 0..* EHDSLaboratoryObservation C.11.5 - Previous results

doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
EHDSLaboratoryObservation.observationCodepreferred
EHDSLaboratoryObservation.observationMethodpreferred
EHDSLaboratoryObservation.observationResult.numericResult.unitspreferred
EHDSLaboratoryObservation.observationResult.codedResultpreferred
EHDSLaboratoryObservation.dataAbsentReasonpreferred
EHDSLaboratoryObservation.observationInterpretationpreferred
EHDSLaboratoryObservation.anatomicLocationpreferred
EHDSLaboratoryObservation.component.codepreferred
EHDSLaboratoryObservation.component.numericResult.unitspreferred
EHDSLaboratoryObservation.component.codedResultpreferred
EHDSLaboratoryObservation.component.dataAbsentReasonpreferred
EHDSLaboratoryObservation.component.observationInterpretationpreferred
EHDSLaboratoryObservation.statuspreferred
EHDSLaboratoryObservation.accreditationStatuspreferred

Differential View

This structure is derived from EHDSObservation

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. EHDSLaboratoryObservation 0..* EHDSObservation
Elements defined in Ancestors:observationDate[x], observationCode, observationName, observationOriginalName, observationMethod, observationDevice, order, performer, reporter, observationResult, dataAbsentReason, referenceRange, observationInterpretation, triggeredBy, hasMember, resultDescription, anatomicLocation, subject, component, status, derivedFrom
Laboratory observation model
Instances of this logical model can be the target of a Reference
... observationCode 1..1 CodeableConcept C.10.2 - Observation code
Binding Description: (preferred): LOINC, NPU
... testKit 0..1 EHDSDevice C.11.2 - Test kit
... calibrator 0..1 Identifier C.11.3 - Calibrator
... previousResults 0..* EHDSLaboratoryObservation C.11.5 - Previous results

doco Documentation for this format

Terminology Bindings (Differential)

PathConformanceValueSetURI
EHDSLaboratoryObservation.observationCodepreferred
EHDSLaboratoryObservation.accreditationStatuspreferred

Snapshot View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. EHDSLaboratoryObservation 0..* EHDSObservation
Elements defined in Ancestors:observationDate[x], observationCode, observationName, observationOriginalName, observationMethod, observationDevice, order, performer, reporter, observationResult, dataAbsentReason, referenceRange, observationInterpretation, triggeredBy, hasMember, resultDescription, anatomicLocation, subject, component, status, derivedFrom
Laboratory observation model
Instances of this logical model can be the target of a Reference
... observationDate[x] 1..1 C.10.1 - Observation date
.... observationDateDateTime dateTime
.... observationDatePeriod Period
... observationCode 1..1 CodeableConcept C.10.2 - Observation code
Binding Description: (preferred): LOINC, NPU
... observationName 1..1 string C.10.3 - Observation name
... observationMethod 0..1 CodeableConcept C.10.5 - Observation method
Binding Description: (preferred): SNOMED CT
... observationDevice 0..1 EHDSDevice C.10.6 - Observation device
... order 0..1 Reference(Service request model) C.10.7 - Order
... performer 0..1 EHDSHealthProfessional C.10.8 - Performer
... reporter 0..1 EHDSHealthProfessional C.10.9 - Reporter
... observationResult 1..1 Base C.10.10 - Observation result
.... textualResult 0..1 string C.10.10.1 - Textual Result
.... numericResult 0..1 Base C.10.10.2 - Numeric Result
..... numericValue[x] 0..1 C.10.10.2.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.10.2.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.10.2.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.10.3 - Coded Result
Binding Description: (preferred): SNOMED CT
... dataAbsentReason 0..1 CodeableConcept C.10.11 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
... referenceRange 0..* Base C.10.12 - Reference range
... observationInterpretation 0..* CodeableConcept C.10.13 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... triggeredBy 0..* Reference(Laboratory observation model | Observation model) C.10.14 - Triggered by
... hasMember 0..* Reference(Laboratory observation model | Observation model) C.10.15 - Has member
... resultDescription 0..1 string C.10.16 - Result description
... anatomicLocation 0..1 CodeableConcept C.10.17 - Anatomic location
Binding Description: (preferred): SNOMED CT
... subject 1..1 Reference(Patient model | Location model | Device model | Organization model | Health professional model | Procedure model) C.10.18 - Subject
... component 0..* Base C.10.19 - Component
.... code 1..1 CodeableConcept C.10.19.1 - Code
Binding Description: (preferred): LOINC, NPU, SNOMED CT
.... textualResult 0..1 string C.10.19.2 - Textual Result
.... numericResult 0..1 Base C.10.19.3 - Numeric Result
..... numericValue[x] 0..1 C.10.19.3.1 - Numeric value
...... numericValueQuantity Quantity
...... numericValueRange Range
..... units 0..1 CodeableConcept C.10.19.3.2 - Units
Binding Description: (preferred): UCUM
..... uncertainty 0..1 Base C.10.19.3.3 - Uncertainty
.... codedResult 0..1 CodeableConcept C.10.19.4 - Coded Result
Binding Description: (preferred): SNOMED CT
.... dataAbsentReason 0..1 CodeableConcept C.10.19.5 - dataAbsentReason
Binding Description: (preferred): HL7 Data absent reason
.... referenceRange 0..* Base C.10.19.6 - Reference range
.... observationInterpretation 0..* CodeableConcept C.10.19.7 - Observation interpretation
Binding Description: (preferred): SNOMED CT, HL7 ObservationInterpretation
... status 1..1 CodeableConcept C.10.20 - Status
Binding Description: (preferred): HL7 Observation status
... derivedFrom 0..* Reference(Observation model | Laboratory observation model | Imaging study model) C.10.21 - Derived from
... testKit 0..1 EHDSDevice C.11.2 - Test kit
... calibrator 0..1 Identifier C.11.3 - Calibrator
... accreditationStatus 0..1 CodeableConcept C.11.4 - Accreditation status
Binding Description: (preferred): Code system to be specified
... previousResults 0..* EHDSLaboratoryObservation C.11.5 - Previous results

doco Documentation for this format

Terminology Bindings

PathConformanceValueSetURI
EHDSLaboratoryObservation.observationCodepreferred
EHDSLaboratoryObservation.observationMethodpreferred
EHDSLaboratoryObservation.observationResult.numericResult.unitspreferred
EHDSLaboratoryObservation.observationResult.codedResultpreferred
EHDSLaboratoryObservation.dataAbsentReasonpreferred
EHDSLaboratoryObservation.observationInterpretationpreferred
EHDSLaboratoryObservation.anatomicLocationpreferred
EHDSLaboratoryObservation.component.codepreferred
EHDSLaboratoryObservation.component.numericResult.unitspreferred
EHDSLaboratoryObservation.component.codedResultpreferred
EHDSLaboratoryObservation.component.dataAbsentReasonpreferred
EHDSLaboratoryObservation.component.observationInterpretationpreferred
EHDSLaboratoryObservation.statuspreferred
EHDSLaboratoryObservation.accreditationStatuspreferred

This structure is derived from EHDSObservation

Summary

 

Other representations of profile: CSV, Excel