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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

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

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

|

^~\&

LAB

767543

ADT

767543

20050201130405

ADT

A04

. . .

delimited vs xml
Delimited vs. XML

|

^~\&

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

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

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
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