EHDS Logical Information Models
0.4.0 - draft

EHDS Logical Information Models, published by Xt-EHR. This guide is not an authorized publication; it is the continuous build for version 0.4.0 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/ and changes regularly. See the Directory of published versions

## Logical Model: EHDSDosage - Detailed Descriptions

Draft as of 2026-03-03

Definitions for the EHDSDosage 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. EHDSDosage
Definition | The model covers usage instructions for administering a medicinal product, focusing on the most frequently used data elements. More complex dosage schemes may require additional elements, which should be communicated as part of the rendered dosage instructions element. Base definition for all types defined in FHIR type system.
Short | Dosage 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. EHDSDosage.renderedDosageInstruction
Definition | Full dosage information as human-readable text covering all dosage steps. Generating the text follows local rules and should include all locally implemented dosage data even when such elements are not present in this model.
Short | Full dosage information as human-readable text covering all dosage steps. Generating the text follows local rules and should include all locally implemented dosage data even when such elements are not present in this model.
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
4. EHDSDosage.dosageDetails
Definition | Details of single dosage scheme step
Short | Details of single dosage scheme step
Control | 0..*
Type | Base
6. EHDSDosage.dosageDetails.sequence
Definition | Order of the dosage instruction, in case one treatment consists of several dosage steps. When two schemes share the same sequence number, they are meant to be running in parallel.
Short | Order of the dosage instruction, in case one treatment consists of several dosage steps. When two schemes share the same sequence number, they are meant to be running in parallel.
Control | 0..1
Type | integer
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. EHDSDosage.dosageDetails.note
Definition | Patient oriented instructions as free text for this dosage step
Short | Patient oriented instructions as free text for this dosage step
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
10. EHDSDosage.dosageDetails.doseAndRate
Definition | Amount of medication administered per one dose (= one timing)
Short | Amount of medication administered per one dose (= one timing)
Control | 0..*
Type | Base
12. EHDSDosage.dosageDetails.doseAndRate.dose[x]
Definition | Amount of medication per one dose. (1 tablet, 2-3 tablets, 20ml)
Short | Amount of medication per one dose. (1 tablet, 2-3 tablets, 20ml)
Control | 0..1
Binding | UCUM (units of measurement), EDQM Standard Terms (units of presentation)
Type | Choice of: Quantity, Range
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
14. EHDSDosage.dosageDetails.doseAndRate.rate[x]
Definition | Amount of medication per time period (e.g. 100mg per 1 hour). When rate is provided per 1 time unit, Quantity data type can be used with a suitable unit (e.g. mg/h, ug/min).
Short | Amount of medication per time period (e.g. 100mg per 1 hour). When rate is provided per 1 time unit, Quantity data type can be used with a suitable unit (e.g. mg/h, ug/min).
Control | 0..1
Binding | UCUM (units of measurement), EDQM Standard Terms (units of presentation)
Type | Choice of: Quantity, Ratio
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
16. EHDSDosage.dosageDetails.repeat
Definition | Repetition of the administration.
Short | Repetition of the administration.
Control | 0..1
Type | Base
18. EHDSDosage.dosageDetails.repeat.bounds[x]
Definition | Time bounds for the treatment (current dosage scheme), Quantity contains a number of time units (e.g 10 days), Period contains start and end date (e.g. 05.08.2023 - 10.08.2023).
Short | Time bounds for the treatment (current dosage scheme), Quantity contains a number of time units (e.g 10 days), Period contains start and end date (e.g. 05.08.2023 - 10.08.2023).
Control | 0..1
Binding | UCUM
Type | Choice of: Quantity, Period
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
20. EHDSDosage.dosageDetails.repeat.duration
Definition | Duration of administration (e.g '5 minutes', '1 hour')
Short | Duration of administration (e.g '5 minutes', '1 hour')
Control | 0..1
Binding | UCUM
Type | Quantity
22. EHDSDosage.dosageDetails.repeat.frequency
Definition | Frequency of intake/administration (e.g 'three times a day')
Short | Frequency of intake/administration (e.g 'three times a day')
Control | 0..1
Type | Base
24. EHDSDosage.dosageDetails.repeat.frequency.numberOfTimes
Definition | Number of times per period (e.g '3 times')
Short | Number of times per period (e.g '3 times')
Control | 0..1
Type | integer
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
26. EHDSDosage.dosageDetails.repeat.frequency.period
Definition | Duration to which the frequency applies (e.g '... / 1 day')
Short | Duration to which the frequency applies (e.g '... / 1 day')
Control | 0..1
Binding | UCUM
Type | Quantity
28. EHDSDosage.dosageDetails.repeat.dayOfWeek
Definition | The day of the week of administration, e.g Mon, Tue, etc
Short | The day of the week of administration, e.g Mon, Tue, etc
Control | 0..*
Type | CodeableConcept
30. EHDSDosage.dosageDetails.repeat.timeOfDay
Definition | Exact time of day of administration (e.g '10:00')
Short | Exact time of day of administration (e.g '10:00')
Control | 0..*
Type | time
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
32. EHDSDosage.dosageDetails.repeat.eventTime
Definition | Time period or event when the administration should happen ('before meal', 'immediately', 'morning')
Short | Time period or event when the administration should happen ('before meal', 'immediately', 'morning')
Control | 0..*
Type | CodeableConcept
34. EHDSDosage.dosageDetails.asNeeded
Definition | Take as needed
Short | Take as needed
Control | 0..1
Type | boolean
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
36. EHDSDosage.dosageDetails.bodySite
Definition | Body site of administration
Short | Body site of administration
Control | 0..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
38. EHDSDosage.dosageDetails.routeOfAdministration
Definition | Route of administration
Short | Route of administration
Control | 0..1
Binding | EDQM Standard Terms
Type | CodeableConcept

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

0. EHDSDosage
Definition | The model covers usage instructions for administering a medicinal product, focusing on the most frequently used data elements. More complex dosage schemes may require additional elements, which should be communicated as part of the rendered dosage instructions element.
Short | Dosage model
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSDosage.renderedDosageInstruction
Definition | Full dosage information as human-readable text covering all dosage steps. Generating the text follows local rules and should include all locally implemented dosage data even when such elements are not present in this model.
Short | Full dosage information as human-readable text covering all dosage steps. Generating the text follows local rules and should include all locally implemented dosage data even when such elements are not present in this model.
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
4. EHDSDosage.dosageDetails
Definition | Details of single dosage scheme step
Short | Details of single dosage scheme step
Control | 0..*
Type | Base
6. EHDSDosage.dosageDetails.sequence
Definition | Order of the dosage instruction, in case one treatment consists of several dosage steps. When two schemes share the same sequence number, they are meant to be running in parallel.
Short | Order of the dosage instruction, in case one treatment consists of several dosage steps. When two schemes share the same sequence number, they are meant to be running in parallel.
Control | 0..1
Type | integer
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. EHDSDosage.dosageDetails.note
Definition | Patient oriented instructions as free text for this dosage step
Short | Patient oriented instructions as free text for this dosage step
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
10. EHDSDosage.dosageDetails.doseAndRate
Definition | Amount of medication administered per one dose (= one timing)
Short | Amount of medication administered per one dose (= one timing)
Control | 0..*
Type | Base
12. EHDSDosage.dosageDetails.doseAndRate.dose[x]
Definition | Amount of medication per one dose. (1 tablet, 2-3 tablets, 20ml)
Short | Amount of medication per one dose. (1 tablet, 2-3 tablets, 20ml)
Control | 0..1
Binding | UCUM (units of measurement), EDQM Standard Terms (units of presentation)
Type | Choice of: Quantity, Range
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
14. EHDSDosage.dosageDetails.doseAndRate.rate[x]
Definition | Amount of medication per time period (e.g. 100mg per 1 hour). When rate is provided per 1 time unit, Quantity data type can be used with a suitable unit (e.g. mg/h, ug/min).
Short | Amount of medication per time period (e.g. 100mg per 1 hour). When rate is provided per 1 time unit, Quantity data type can be used with a suitable unit (e.g. mg/h, ug/min).
Control | 0..1
Binding | UCUM (units of measurement), EDQM Standard Terms (units of presentation)
Type | Choice of: Quantity, Ratio
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
16. EHDSDosage.dosageDetails.repeat
Definition | Repetition of the administration.
Short | Repetition of the administration.
Control | 0..1
Type | Base
18. EHDSDosage.dosageDetails.repeat.bounds[x]
Definition | Time bounds for the treatment (current dosage scheme), Quantity contains a number of time units (e.g 10 days), Period contains start and end date (e.g. 05.08.2023 - 10.08.2023).
Short | Time bounds for the treatment (current dosage scheme), Quantity contains a number of time units (e.g 10 days), Period contains start and end date (e.g. 05.08.2023 - 10.08.2023).
Control | 0..1
Binding | UCUM
Type | Choice of: Quantity, Period
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
20. EHDSDosage.dosageDetails.repeat.duration
Definition | Duration of administration (e.g '5 minutes', '1 hour')
Short | Duration of administration (e.g '5 minutes', '1 hour')
Control | 0..1
Binding | UCUM
Type | Quantity
22. EHDSDosage.dosageDetails.repeat.frequency
Definition | Frequency of intake/administration (e.g 'three times a day')
Short | Frequency of intake/administration (e.g 'three times a day')
Control | 0..1
Type | Base
24. EHDSDosage.dosageDetails.repeat.frequency.numberOfTimes
Definition | Number of times per period (e.g '3 times')
Short | Number of times per period (e.g '3 times')
Control | 0..1
Type | integer
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
26. EHDSDosage.dosageDetails.repeat.frequency.period
Definition | Duration to which the frequency applies (e.g '... / 1 day')
Short | Duration to which the frequency applies (e.g '... / 1 day')
Control | 0..1
Binding | UCUM
Type | Quantity
28. EHDSDosage.dosageDetails.repeat.dayOfWeek
Definition | The day of the week of administration, e.g Mon, Tue, etc
Short | The day of the week of administration, e.g Mon, Tue, etc
Control | 0..*
Type | CodeableConcept
30. EHDSDosage.dosageDetails.repeat.timeOfDay
Definition | Exact time of day of administration (e.g '10:00')
Short | Exact time of day of administration (e.g '10:00')
Control | 0..*
Type | time
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
32. EHDSDosage.dosageDetails.repeat.eventTime
Definition | Time period or event when the administration should happen ('before meal', 'immediately', 'morning')
Short | Time period or event when the administration should happen ('before meal', 'immediately', 'morning')
Control | 0..*
Type | CodeableConcept
34. EHDSDosage.dosageDetails.asNeeded
Definition | Take as needed
Short | Take as needed
Control | 0..1
Type | boolean
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
36. EHDSDosage.dosageDetails.bodySite
Definition | Body site of administration
Short | Body site of administration
Control | 0..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
38. EHDSDosage.dosageDetails.routeOfAdministration
Definition | Route of administration
Short | Route of administration
Control | 0..1
Binding | EDQM Standard Terms
Type | CodeableConcept

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

0. EHDSDosage
Definition | The model covers usage instructions for administering a medicinal product, focusing on the most frequently used data elements. More complex dosage schemes may require additional elements, which should be communicated as part of the rendered dosage instructions element.
Short | Dosage model
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSDosage.renderedDosageInstruction
Definition | Full dosage information as human-readable text covering all dosage steps. Generating the text follows local rules and should include all locally implemented dosage data even when such elements are not present in this model.
Short | Full dosage information as human-readable text covering all dosage steps. Generating the text follows local rules and should include all locally implemented dosage data even when such elements are not present in this model.
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
4. EHDSDosage.dosageDetails
Definition | Details of single dosage scheme step
Short | Details of single dosage scheme step
Control | 0..*
Type | Base
6. EHDSDosage.dosageDetails.sequence
Definition | Order of the dosage instruction, in case one treatment consists of several dosage steps. When two schemes share the same sequence number, they are meant to be running in parallel.
Short | Order of the dosage instruction, in case one treatment consists of several dosage steps. When two schemes share the same sequence number, they are meant to be running in parallel.
Control | 0..1
Type | integer
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
8. EHDSDosage.dosageDetails.note
Definition | Patient oriented instructions as free text for this dosage step
Short | Patient oriented instructions as free text for this dosage step
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
10. EHDSDosage.dosageDetails.doseAndRate
Definition | Amount of medication administered per one dose (= one timing)
Short | Amount of medication administered per one dose (= one timing)
Control | 0..*
Type | Base
12. EHDSDosage.dosageDetails.doseAndRate.dose[x]
Definition | Amount of medication per one dose. (1 tablet, 2-3 tablets, 20ml)
Short | Amount of medication per one dose. (1 tablet, 2-3 tablets, 20ml)
Control | 0..1
Binding | UCUM (units of measurement), EDQM Standard Terms (units of presentation)
Type | Choice of: Quantity, Range
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
14. EHDSDosage.dosageDetails.doseAndRate.rate[x]
Definition | Amount of medication per time period (e.g. 100mg per 1 hour). When rate is provided per 1 time unit, Quantity data type can be used with a suitable unit (e.g. mg/h, ug/min).
Short | Amount of medication per time period (e.g. 100mg per 1 hour). When rate is provided per 1 time unit, Quantity data type can be used with a suitable unit (e.g. mg/h, ug/min).
Control | 0..1
Binding | UCUM (units of measurement), EDQM Standard Terms (units of presentation)
Type | Choice of: Quantity, Ratio
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
16. EHDSDosage.dosageDetails.repeat
Definition | Repetition of the administration.
Short | Repetition of the administration.
Control | 0..1
Type | Base
18. EHDSDosage.dosageDetails.repeat.bounds[x]
Definition | Time bounds for the treatment (current dosage scheme), Quantity contains a number of time units (e.g 10 days), Period contains start and end date (e.g. 05.08.2023 - 10.08.2023).
Short | Time bounds for the treatment (current dosage scheme), Quantity contains a number of time units (e.g 10 days), Period contains start and end date (e.g. 05.08.2023 - 10.08.2023).
Control | 0..1
Binding | UCUM
Type | Choice of: Quantity, Period
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
20. EHDSDosage.dosageDetails.repeat.duration
Definition | Duration of administration (e.g '5 minutes', '1 hour')
Short | Duration of administration (e.g '5 minutes', '1 hour')
Control | 0..1
Binding | UCUM
Type | Quantity
22. EHDSDosage.dosageDetails.repeat.frequency
Definition | Frequency of intake/administration (e.g 'three times a day')
Short | Frequency of intake/administration (e.g 'three times a day')
Control | 0..1
Type | Base
24. EHDSDosage.dosageDetails.repeat.frequency.numberOfTimes
Definition | Number of times per period (e.g '3 times')
Short | Number of times per period (e.g '3 times')
Control | 0..1
Type | integer
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
26. EHDSDosage.dosageDetails.repeat.frequency.period
Definition | Duration to which the frequency applies (e.g '... / 1 day')
Short | Duration to which the frequency applies (e.g '... / 1 day')
Control | 0..1
Binding | UCUM
Type | Quantity
28. EHDSDosage.dosageDetails.repeat.dayOfWeek
Definition | The day of the week of administration, e.g Mon, Tue, etc
Short | The day of the week of administration, e.g Mon, Tue, etc
Control | 0..*
Type | CodeableConcept
30. EHDSDosage.dosageDetails.repeat.timeOfDay
Definition | Exact time of day of administration (e.g '10:00')
Short | Exact time of day of administration (e.g '10:00')
Control | 0..*
Type | time
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
32. EHDSDosage.dosageDetails.repeat.eventTime
Definition | Time period or event when the administration should happen ('before meal', 'immediately', 'morning')
Short | Time period or event when the administration should happen ('before meal', 'immediately', 'morning')
Control | 0..*
Type | CodeableConcept
34. EHDSDosage.dosageDetails.asNeeded
Definition | Take as needed
Short | Take as needed
Control | 0..1
Type | boolean
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
36. EHDSDosage.dosageDetails.bodySite
Definition | Body site of administration
Short | Body site of administration
Control | 0..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSBodyStructure
38. EHDSDosage.dosageDetails.routeOfAdministration
Definition | Route of administration
Short | Route of administration
Control | 0..1
Binding | EDQM Standard Terms
Type | CodeableConcept