1. http://www.hl7.org.uk An Introduction to HL7 Version 2 Charlie Bishop 9 February 2005 HL7 and its key role in NPfIT and Existing Systems Integration

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

3. Version 2.0 HL72UK vA.2 Version 2.6 – under development / ballot Version 2.1 Version 2.2 Version 2.3 Version 2.3.1 Version 2.4 Version 2.5 History of v2 Version 1.01987 1994 1999 2005 1988 1990 1997 2000 2003 1996 Version 3 – development starts HL7 UK established

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 1. Introduction 2. Control 3. Patient Administration 4. Order Entry 5. Query 6. Finance 7. Observation Reporting 8. Master Files 9. Medical Records 10. Scheduling 11. Patient Referral 12. Patient Care 13. Clinical Laboratory Automation 14. 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 EVN||20050201101314||||20050201095000 PID|||1234567891||EXAMPLE^DAVID^S||19590520|M|||23 MAINSTREET^^ANYTOWN^ > ^AN10 8SW||01234 567890 PD1||||DR A WELBY PV1||0||NEW|||DR K JONES

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 | ^~\& LAB 767543 ADT 767543 20050201130405 ADT A04...

11. Delimited vs. XML MSH|^~\&|LAB|767543|ADT|767543|20050201130405||ADT^A04|XX3657|P|2.4 EVN||20050201101314||||20050201095000 PID|||1234567891||EXAMPLE^DAVID^S||19590520|M|||23 MAINSTREET^^ANYTOWN^^AN10 8SW||01234 567890 PD1||||DR A WELBY PV1||0||NEW|||DR K JONES | ^~\& LAB 767543 ADT 767543 20050201130405 ADT A04 XX3657 P 2.4 20050201101314 20050201095000 20050201095000 1234567891 NHS NH AB12345 EXAMPLE DAVID S 19590520 M 23 MAIN STREET ANYTOWN AN10 8SW 01234 567890 DR A WELBY 0 NEW DR K JONES

12. Issues Inconsistent use –Multiple versions –Z-Segments –Interpretation –Localisation Support for clinical data Communication approach –Broadcast vs. targeted Seen one HL7 v2 interface– seen one HL7 v2 interface

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!