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HL7 and its key role in NPfIT and Existing Systems Integration. An Introduction to HL7 Version 2. Charlie Bishop 9 February 2005. Agenda. History of v2 Scope of v2 Structure of the v2 Standard v2 Message Structure v2 Issues The Future. History of v2. 1987. 1988. Version 2.0. 1990.

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Presentation Transcript
agenda
Agenda
  • History of v2
  • Scope of v2
  • Structure of the v2 Standard
  • v2 Message Structure
  • v2 Issues
  • The Future
history of v2
History of v2

1987

1988

Version 2.0

1990

Version 2.1

1994

Version 2.2

1996

Version 3 – development starts

1997

Version 2.3

1999

Version 2.3.1

2000

Version 2.4

HL7 UK established

HL72UK vA.2

2003

Version 2.5

2005

Version 2.6 – under development / ballot

Version 1.0

an international standard
An International Standard
  • USA (90% of hospitals)
  • UK
  • Canada
  • Australia
  • Netherlands
  • Germany
  • Japan
  • Others
scope
Scope
  • Patient Administration
    • Registration / MPI
    • ADT / Inpatients
    • Scheduling / Outpatients
    • Waiting List (UK)
    • Medical Records
  • Clinical
    • Orders
    • Results
    • Provision of Care
  • Financial
structure of the standard
Structure of the Standard

Chapter

  • Introduction
  • Control
  • Patient Administration
  • Order Entry
  • Query
  • Finance
  • Observation Reporting
  • Master Files
  • Medical Records
  • Scheduling
  • Patient Referral
  • Patient Care
  • Clinical Laboratory Automation
  • Network Protocols
message structure
Message Structure
  • Triggers
  • Messages
    • Segments
      • Fields
  • Data Types
example v2 message
Example v2 Message

MSH|^~\&|LAB|767543|ADT|767543|20050201130405||ADT^A04|XX3657|P|2.4<CR>

EVN||20050201101314||||20050201095000<CR>

PID|||1234567891||EXAMPLE^DAVID^S||19590520|M|||23 MAINSTREET^^ANYTOWN^

> ^AN10 8SW||01234 567890<CR>

PD1||||DR A WELBY<CR>

PV1||0||NEW|||DR K JONES<CR>

xml representation
XML Representation
  • Provides compatibility with industry standard tools
  • Alternative syntax
    • Data semantic is identical
  • Simple transform between 2 syntaxes
    • Segments, Fields and Data Types represented as elements
example v2 xml message
Example v2 XML Message

<!DOCTYPE ADT_A04 SYSTEM "hl7_v231.dtd">

<ADT_A04>

<MSH>

<MSH.1>|</MSH.1>

<MSH.2>^~\&amp;</MSH.2>

<MSH.3>

<CM.1>LAB</CM.1>

</MSH.3>

<MSH.4>767543</MSH.4>

<MSH.5>ADT</MSH.5>

<MSH.6>767543</MSH.6>

<MSH.7>20050201130405</MSH.7>

<MSH.9>

<CM_MSG_TYPE.1>ADT</CM_MSG_TYPE.1>

<CM_MSG_TYPE.2>A04</CM_MSG_TYPE.2>

</MSH.9>

. . .

delimited vs xml
Delimited vs. XML

<!DOCTYPE ADT_A03 SYSTEM "hl7_v231.dtd">

<ADT_A03>

<MSH>

<MSH.1>|</MSH.1>

<MSH.2>^~\&amp;</MSH.2>

<MSH.3>

<CM.1>LAB</CM.1>

</MSH.3>

<MSH.4>767543</MSH.4>

<MSH.5>ADT</MSH.5>

<MSH.6>767543</MSH.6>

<MSH.7>20050201130405</MSH.7>

<MSH.9>

<CM_MSG_TYPE.1>ADT</CM_MSG_TYPE.1>

<CM_MSG_TYPE.2>A04</CM_MSG_TYPE.2>

</MSH.9>

<MSH.10>XX3657</MSH.10>

<MSH.11>

<ID.1>P</ID.1>

</MSH.11>

<MSH.12>

<ID.1>2.4</ID.1>

</MSH.12>

</MSH>

<EVN>

<EVN.2>20050201101314</EVN.2>

<EVN.6>20050201095000</EVN.6>

</EVN>

<PID>

<EVN.6>20050201095000</EVN.6>

</EVN>

<PID>

<PID.3.LST>

<PID.3>

<CX.1>1234567891</CX.1>

<CX.4>NHS<CX.4>

<CX.5>NH<CX.5>

</PID.3>

<PID.3>

<CX.1>AB12345</CX.1>

</PID.3>

</PID.3.LST>

<PID.4.LST>

<PID.5.LST>

<PID.5>

<XPN.1>EXAMPLE</XPN.1>

<XPN.2>DAVID</XPN.2>

<XPN.3>S</XPN.3>

</PID.5>

</PID.5.LST>

<PID.7>19590520</PID.7>

<PID.8>M</PID.8>

<PID.11.LST>

<PID.11>

<XAD.1>23 MAIN STREET</XAD.1>

<XAD.3>ANYTOWN</XAD.3>

<XAD.5>AN10 8SW</XAD.5>

</PID.11>

</PID.11.LST>

<PID.13.LST>

<PID.13>

<XTN.1>01234 567890</XTN.1>

</PID.13>

</PID.13.LST>

<PD1>

<PD1.4.LST>

<PD1.4>

<XCN.1>DR A WELBY</XCN.1>

</PD1.4>

</PD1.4.LST>

</PD1>

<PV1>

<PV1.2>0</PV1.2>

<PV1.4>NEW</PV1.4>

<PV1.7.LST>

<PV1.7>

<XCN.1>DR K JONES</XCN.1>

</PV1.7>

</PV1.7.LST>

</PV1>

</ADT_A03>

MSH|^~\&|LAB|767543|ADT|767543|20050201130405||ADT^A04|XX3657|P|2.4<CR>

EVN||20050201101314||||20050201095000<CR>

PID|||1234567891||EXAMPLE^DAVID^S||19590520|M|||23 MAINSTREET^^ANYTOWN^^AN10 8SW||01234 567890<CR>

PD1||||DR A WELBY<CR>

PV1||0||NEW|||DR K JONES<CR>

issues
Issues
  • Inconsistent use
    • Multiple versions
    • Z-Segments
    • Interpretation
    • Localisation

Seen one HL7 v2 interface

– seen one HL7 v2 interface

  • Support for clinical data
  • Communication approach
    • Broadcast vs. targeted
the future
The Future
  • HL7 v2 will continue to be developed
  • HL7 v2 will continue to be widely used in the NHS
  • Delimited vs. XML
  • Mapping to v3
  • HL7 UK v2 sub-group