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HL7 V2 and V3 – where next?

HL7 V2 and V3 – where next?. Charlie McCay HL7UK Chair-elect Charlie@RamseySystems.co.uk. Charlie McCay. Interest in Clear and Testable specifications Chair Elect HL7UK Co-chair XML and Implementation groups in HL7.org Consult for NPfIT and others Speaking as myself (and for HL7UK).

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HL7 V2 and V3 – where next?

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  1. HL7 V2 and V3 – where next? Charlie McCay HL7UK Chair-elect Charlie@RamseySystems.co.uk

  2. Charlie McCay • Interest in Clear and Testable specifications • Chair Elect HL7UK • Co-chair XML and Implementation groups in HL7.org • Consult for NPfIT and others • Speaking as myself (and for HL7UK) 2/25

  3. Topics • HL7 • Data Items and Technology • V2 • V3 • What to do now 3/25

  4. How HL7 works • HL7.org and HL7UK… • Products… • Organisation… • Meetings… • Ballots… 4/25

  5. HL7.org and HL7UK • Membership organisations • Both aim to provide standards that support Clinical Information System Interoperability • HL7UK does this in a UK context 5/25

  6. HL7 Products • Specifications • V2, V3, CDA, Arden, CCOW, … • Informative, Normative or Reference • Methods for developing specifications • MDF, HDF, … 6/25

  7. HL7 Organisation • ANSI, ISO, CEN • TCs, SIGs and others • Technical Committees • Special Interest Groups • HL7.org, and the affiliates 7/25

  8. HL7 Meetings • Working Group Meetings • Three meetings a year, 4-500 attendees • Committee work and tutorials • Harmonisation • Three times a year, 40 attendees • Conference calls, Mailing lists 8/25

  9. HL7 Ballots • Central and Affiliate • Committee and Membership • Joining ballot pools, and meaning of votes • Resolution of negatives 9/25

  10. Topics • HL7 • Data Items and Technology • V2 • V3 • What to do now 10/25

  11. Data items and Technology • “Semantics” is the definition of the data items that are permitted in the message • this is HL7 core business • “Technology” is what is used to transmit that meaning between systems • HL7 is a convenient place to share best practice 11/25

  12. Topics • HL7 • Data Items and Technology • V2 • V3 • What to do now 12/25

  13. V2 – what it looks like MSH|^&~\|HIS|HSP1|BEDMGMT|HSP1|200105311136||RSP^Znn^RSP_Q11|1|P|2.4| MSA|AA|8699| QAK|1022|OK| Znn^Find Location^HL70471|1|1|0 QPD|Znn^Find Location^HL70471|1022|LOC^Location Master^HL70175|HSP1|2N^101^^HSP1 MFE|MAD|||2N^101^^HSP1|PL LOC|2N^101^^HSP1|Station 2 North, room 101|R||(407)804-5000||IVP|P LCH|2N^101^^HSP1|||PRL^Privacy level^HL70324|S^Semi-private room^HL70262 LCH|2N^101^^HSP1|||SMK^Smoking^HL70324|Y^^HL70136 13/25

  14. V2 • Widely used in secondary care • Implementation-specific profiles • Used for “within institution” messaging • Messaging workbench for profiles • |^ and XML representations 14/25

  15. History revisited • V2 messages defined “as needed” • Limited depth because of the encoding • Implicit groupings • Ugly datatypes • “Z” segments 15/25

  16. Topics • HL7 • Data Items and Technology • V2 • V3 • What to do now 16/25

  17. HL7 V3 • What it looks like… • Background… • Cascade of Models… • Implementation Technology Specification… 17/25

  18. V3 – what it looks like <product contextControlCode="OP" typeCode="PRD" type="Participation"> <manufacturedProduct classCode="MANU" type="RoleHeir"> <manufacturedRequestedMaterial determinerCode="KIND" classCode="MMAT" type="ManufacturedMaterial"> <code codeSystem="2.16.840.1.113883.2.1.3.2.4.15" code="1084011000001108" displayName="Betamethasone valerate 0.1% cream 30 gram"> </code> </manufacturedRequestedMaterial> </manufacturedProduct> </product> 18/25

  19. Background to V3 • Moving out of the hospital • Too many committees • Richer data structures - Models • Changing technology • Not just messaging 19/25

  20. Cascade of Models RIM Medical Records Lab Pharmacy 20/25

  21. Implementation Technology Specification • Abstract definitions as XML (MIF) • XML first ITS off the block … • Java SIG for internal application interfaces • Other possibilities • HOM – HL7 Object Model ? • ??? 21/25

  22. XML Defined and Validated • ITS defines the set of valid instances • Schemas and other tools test conformance • Validation tools will improve • Schemas generated using XSLT • Different flavours of Schema could be done • Other validation tools 22/25

  23. Topics • HL7 • Data Items and Technology • V2 • V3 • What to do now 23/25

  24. Where Next? • National and local communications • Maintain semantic mappings (expensive) • Semantic migration harder than technical migration • Collaboration for semantic mappings • Sharing best practice • Feedback on what helps and what does not 24/25

  25. Products • Implementation Resource Kit • Evolution of UK HL7 (V2 and V3) standards • Frequently asked Questions • What else do you need? 25/25

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