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An Introduction to HL7 Version 2

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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An Introduction to HL7 Version 2

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  1. HL7 and its key role in NPfIT and Existing Systems Integration An Introduction toHL7 Version 2 Charlie Bishop 9 February 2005

  2. Agenda • History of v2 • Scope of v2 • Structure of the v2 Standard • v2 Message Structure • v2 Issues • The Future

  3. 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

  4. An International Standard • USA (90% of hospitals) • UK • Canada • Australia • Netherlands • Germany • Japan • Others

  5. Scope • Patient Administration • Registration / MPI • ADT / Inpatients • Scheduling / Outpatients • Waiting List (UK) • Medical Records • Clinical • Orders • Results • Provision of Care • Financial

  6. 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

  7. Message Structure • Triggers • Messages • Segments • Fields • Data Types

  8. 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>

  9. 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

  10. 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> . . .

  11. 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>

  12. 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

  13. 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

  14. Thank you!

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