AU Core Implementation Guide
2.0.1-ci-build - CI Build AU

AU Core Implementation Guide, published by HL7 Australia. This guide is not an authorized publication; it is the continuous build for version 2.0.1-ci-build built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/hl7au/au-fhir-core/ and changes regularly. See the Directory of published versions

## Future of AU Core

Page standards status: Informative

### AU Core Yearly Updates

AU Core will be published yearly. Yearly AU Core updates reflect changes to:

- AUCDI
- AU Base
- requests from the Australian FHIR community
- requests from downstream IG projects e.g. AU eRequesting or AU Patient Summary

The yearly update approach is outlined in the figure below:

Figure 1: Yearly update of AU Core

### AU Core Development Process

The first release of AU Core was an 18 month process from HL7 AU proposal to publication, this subsequent release follows an ongoing maintenance release process, outlined in the figure below:

Figure 2: AU Core R2 development process

#### Maturing the Baseline

The approach to develop and mature AU Core is outlined in the figure below making reference to the Australian FHIR Maturity Level (AFMM) levels.

Figure 3: Maturing the AU Core baseline

### Future Candidate Requirements Under Consideration

The following items are under consideration to add to AU Core (Link to Deferred List in Jira).

- Last Updated: AUCDI element Last Updated is intended to reflect when a data group was last updated, capturing clinical relevance and currency. A known and implemented solution in other jurisdictions for similar requirements is the use of the Provenance resource. An alternative to the use of Provenance may be the definition of custom extensions or `meta.lastUpdated`. Future versions of AU Core will develop and test approaches to addressing Last Updated.
- Dosage: The Dosage data type is complex, and the requirements in AU Base Dosage are not sufficient to provide clarity on the minimum requirements for supporting dosage and timing in Australia. Future versions of AU Core may develop and test an AU Core Dosage profile to support common implementation of medicine information.
- Bundle: Future versions of AU Core may consider developing and testing AU Core Bundle profile to support approaches to sharing clinical documents across multiple use cases.
- Composition: Future versions of AU Core may consider developing and testing AU Core Composition profile to support approaches to sharing clinical documents across multiple use cases.
- DocumentReference: Future versions of AU Core will develop and test an AU Core DocumentReference profile to support sharing of clinical notes across multiple use cases to support common implementation.
- Device: Use of the Device resource for medical devices, and devices that perform, observe, or author clinical data, are required to support multiple downstream use cases including eRequesting and patient summary. Future versions of AU Core will develop and test profiles to support common implementation of Device information.
- Coverage: Use of the Coverage resource is required to support multiple downstream use cases including eRequesting. Future versions of AU Core will develop and test minimum requirements for coverage across multiple use cases to support common implementation.
- ServiceRequest: Use of the ServiceRequest resource is required to support multiple downstream use cases including eRequesting. Future versions of AU Core will develop and test minimum requirements for requests across multiple use cases to support common implementation.
- Additional Diagnostic Information: Additional AU Core profiles to support common implementation of additional aspects of diagnostic results including imaging, specimen, and reports are expected to be developed and tested in future versions of AU Core.
- Additional Medicinal Information: Additional AU Core profiles to support common implementation of additional aspects of medicinal information and workflow including administration and dispense are expected to be developed and tested in future versions of AU Core.
- Pregnancy Information: Additional AU Core profiles to support common implementation of widely shared pregnancy information used in multiple use cases including pregnancy assertion (sometimes referred to as pregnancy status), last menstrual period and estimated date of delivery, may be developed and tested in future versions of AU Core.
- No Known X: Additional work to clarify how a system can represent an affirmative state that a patient has no known current medicines, no history of immunisation, no history of relevant procedures, or other relevant concepts of "no known x" or "no history of x" is expected to be undertaken in future releases.
- Key clinical elements and Missing Data requirements: It is not clear at this point whether there is a case for prohibiting 'missing data' on resource.code e.g. AllergyIntolerance.code, Condition.code, or Medication.code. At this time it is not clear how prohibition could be structured in AU Core noting there is no equivalent obligation code for 'don't allow missing data' and as the data type for these elements is CodeableConcept, preadoption of R5 mustHaveValue is not applicable (only for primitive types).
- Record or Update Data: Systems may use operations that create and update resources for any of the profiles in this IG. However, more guidance and minimum requirements need to be developed and tested on writing and updating data in the context of AU Core implementations.
- Profile Only implementation clarity: Additional clarification on how to implement AU Core as Profile Only may be useful as a Profile Only Server CapabilityStatement.
- Guidance on downstream implementation of AU Core: Future versions of AU Core will provide further detail on how to address implementation of AU Core through adoption of AU Core in other FHIR Specifications.
- Search Parameter Definitions: AU Core SearchParameters currently defined in AU Core include search parameters with support for chained search. Future versions of AU Core will include the complete list of search parameters supported by AU Core and the rules for use as a set of FHIR SearchParameters as specified in AU Core CapabilityStatements.
- AU Core profile policies and governance: Future versions of AU Core will make reference to policies and conventions for HL7 AU FHIR artefacts. Given the nature and scope of the work across all HL7 AU FHIR implementation guides, there is likely to be an HL7 AU project to develop the material and provide recommendations for enhancing HL7 AU Implementation Guides. This work will address related issues and ensure alignment with governance practices.