ACT-NOW Implementation Guide
0.5.0 - ci-build

ACT-NOW Implementation Guide, published by Te aho o te kahu - Cancer Control Agency. This guide is not an authorized publication; it is the continuous build for version 0.5.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/tewhatuora/actnow/ and changes regularly. See the Directory of published versions

## Extension: CycleDay

Official URL: http://canshare.co.nz/fhir/StructureDefinition/an-cycle-day | Version: 0.5.0
Draft as of 2026-06-15 | Computable Name: CycleDay

The day of the cycle that this medication was given on. Includes planned day and administered day. Not the same as intended cycle length.

Context of Use

This extension may be used on the following element(s)

- Element ID: `MedicationAdministration`

Usage info

Usages:

- Use this Extension: ACT-NOW medication administration
- Examples for this Extension: MedicationAdministration/medicationadministration-1

You can also check for usages in the FHIR IG Statistics

### Formal Views of Extension Content

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

- Differential Table
- Snapshot Table
- Statistics/References
- All

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Extension
Slices for extension |  |  |  | Content/Rules for all slices
extension:planned |  | 0..1 | Extension | Planned date
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "planned"
value[x] |  | 0..1 | integer | Value of extension
extension:administered |  | 0..1 | Extension | Planned date
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "administered"
value[x] |  | 0..1 | integer | Value of extension
url |  | 1..1 | uri | "http://canshare.co.nz/fhir/StructureDefinition/an-cycle-day"
value[x] |  | 0..0 |  | Value of extension
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Extension
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
extension:planned |  | 0..1 | Extension | Planned date
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "planned"
value[x] |  | 0..1 | integer | Value of extension
extension:administered |  | 0..1 | Extension | Planned date
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "administered"
value[x] |  | 0..1 | integer | Value of extension
url |  | 1..1 | uri | "http://canshare.co.nz/fhir/StructureDefinition/an-cycle-day"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: The day of the cycle that this medication was given on. Includes planned day and administered day. Not the same as intended cycle length.

- planned: integer: The day that this administration should have been given on
- administered: integer: The day that this administration should have been given on

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Extension
Slices for extension |  |  |  | Content/Rules for all slices
extension:planned |  | 0..1 | Extension | Planned date
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "planned"
value[x] |  | 0..1 | integer | Value of extension
extension:administered |  | 0..1 | Extension | Planned date
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "administered"
value[x] |  | 0..1 | integer | Value of extension
url |  | 1..1 | uri | "http://canshare.co.nz/fhir/StructureDefinition/an-cycle-day"
value[x] |  | 0..0 |  | Value of extension
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Extension
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
extension:planned |  | 0..1 | Extension | Planned date
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "planned"
value[x] |  | 0..1 | integer | Value of extension
extension:administered |  | 0..1 | Extension | Planned date
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "administered"
value[x] |  | 0..1 | integer | Value of extension
url |  | 1..1 | uri | "http://canshare.co.nz/fhir/StructureDefinition/an-cycle-day"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: The day of the cycle that this medication was given on. Includes planned day and administered day. Not the same as intended cycle length.

- planned: integer: The day that this administration should have been given on
- administered: integer: The day that this administration should have been given on

Other representations of profile: CSV, Excel, Schematron

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`