HL7 V2 and V3 where next

1
HL7 V2 and V3 where next?

• Charlie McCay
• HL7UK Chair-elect
• Charlie_at_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)

3
Topics

• HL7
• Data Items and Technology
• V2
• V3
• What to do now

4
How HL7 works

• HL7.org and HL7UK
• Products
• Organisation
• Meetings
• Ballots

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HL7.org and HL7UK

• Membership organisations
• Both aim to provide standards that support
  Clinical Information System Interoperability
• HL7UK does this in a UK context

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HL7 Products

• Specifications
• V2, V3, CDA, Arden, CCOW,
• Informative, Normative or Reference
• Methods for developing specifications
• MDF, HDF,

7
HL7 Organisation

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

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

9
HL7 Ballots

• Central and Affiliate
• Committee and Membership
• Joining ballot pools, and meaning of votes
• Resolution of negatives

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Topics

• HL7
• Data Items and Technology
• V2
• V3
• What to do now

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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

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Topics

• HL7
• Data Items and Technology
• V2
• V3
• What to do now

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V2 what it looks like

• MSH\HISHSP1BEDMGMTHSP1200105311136RSPZ
  nnRSP_Q111P2.4
• MSAAA8699
• QAK1022OK ZnnFind LocationHL70471110
• QPDZnnFind LocationHL704711022LOCLocation
  MasterHL70175HSP12N101HSP1
• MFEMAD2N101HSP1PL
• LOC2N101HSP1Station 2 North, room
  101R(407)804-5000IVPP
• LCH2N101HSP1PRLPrivacy levelHL70324SSem
  i-private roomHL70262
• LCH2N101HSP1SMKSmokingHL70324YHL70136

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V2

• Widely used in secondary care
• Implementation-specific profiles
• Used for within institution messaging
• Messaging workbench for profiles
• and XML representations

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History revisited

• V2 messages defined as needed
• Limited depth because of the encoding
• Implicit groupings
• Ugly datatypes
• Z segments

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Topics

• HL7
• Data Items and Technology
• V2
• V3
• What to do now

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HL7 V3

• What it looks like
• Background
• Cascade of Models
• Implementation Technology Specification

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V3 what it looks like

• ltproduct contextControlCode"OP" typeCode"PRD"
  type"Participation"gt
• ltmanufacturedProduct classCode"MANU"
  type"RoleHeir"gt
• ltmanufacturedRequestedMaterial determinerCode"KIN
  D" classCode"MMAT" type"ManufacturedMaterial"gt
• ltcode codeSystem"2.16.840.1.113883.2.1.3.2.4.15"
  code"1084011000001108" displayName"Betamethasone
  valerate 0.1 cream 30 gram"gt
• lt/codegt
• lt/manufacturedRequestedMaterialgt
• lt/manufacturedProductgt
• lt/productgt

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Background to V3

• Moving out of the hospital
• Too many committees
• Richer data structures - Models
• Changing technology
• Not just messaging

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Cascade of Models
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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 ?
• ???

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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

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Topics

• HL7
• Data Items and Technology
• V2
• V3
• What to do now

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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

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Products

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