1. Introduction to HL7 Version 3
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HL7
ANSI ACCREDITED STANDARDS ORGANIZATION
HL7 Tutorial
Introduction to HL7 Version 3
W. Ted Klein
Senior Scientist, McKesson HBOC
HL7 Modeling and Methodology Technical Committee Co-Chair
1/25/99
© 1998,1999 Health Level 7
© 1999, Health Level 7

2. What Is HL7? The HL7 organization was founded in 1987
In June 1994 HL7 was designated as an ANSI accredited standards development organization (SDO)
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© 1998,1999 Health Level 7

3. V3 Methodology Tutorial
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HL7 Mission Statement
To provide standards for the exchange, management and integration of data that supports clinical patient care and the management, delivery and evaluation of healthcare services.
... the complete ‘life cycle’ of a standards specification -- development, adoption, market recognition, utilization and adherence.
1/25/99
© 1998,1999 Health Level 7
© 1999, Health Level 7

4. Standard Development Participants
M&M Methodology, Measurement, Coordination
Executive Committee Business Strategy & Motivation
Why?
How?
V3.0
When?
What?
Technical Steering Committee Planning & Enforcement
Technical Committees Modeling & Voting
1/25/99
© 1998,1999 Health Level 7

5. HL7 Standard Versions 2.0 (1988) Prototype 2.1 (1990) First standard
2.2 (1994) In operation
2.3 (1997) Current ANSI standard
2.3.1 (1998) Currently in ballot
3.0 (1999) Substantial change in process (introduction of formal methods)
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© 1998,1999 Health Level 7

6. What does “HL7” stand for?
V3 Methodology Tutorial
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What does “HL7” stand for?
A domain-specific, common protocol for the exchange of health care information.
HL7
Function
7 Application
6 Presentation
5 Session
4 Transport
Communication
3 Network
2 Data Link
1 Physical
ISO-OSI Communication Architecture Model
1/25/99
© 1998,1999 Health Level 7
© 1999, Health Level 7

7. Yesterday, change was a by-product of business.
Business Problem
Yesterday, change was a by-product of business.
Today, business is a buy-product of change.
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© 1998,1999 Health Level 7

8. V3 Methodology Tutorial
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Business Realities
Accelerating pace of business change - rapid shifting of requirements demands increased IS responsiveness
Increasing IS complexity - constant evolution of new technologies (e.g., client/server, Internet, multimedia)
Increasing competition - demands to reduce time-to-market while decreasing costs and improving quality
1/25/99
© 1998,1999 Health Level 7
© 1999, Health Level 7 5 5

9. Accelerating Pace of Business Change
Migration Towards a Wellness Model
Managing Visit
Managing
Care
Managing
Health
Market Reform
Socialized Medicine
Present time
Clinton’s Reform
Initial
Fee-for-service, on-demand
Anticipated
Preventive, episodal
Transitional
Capitated, case-based
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© 1998,1999 Health Level 7

10. Increased IS Complexity
Client/Server, Internet, Multimedia
Centralized Computing
(Batch)
Network Computing (RPC)
IBM
Digital
Dell
Micron HP
Community Computing
(Internet)
Enterprise Computing (Client/Server)
1/25/99
© 1998,1999 Health Level 7

11. Chapter-Specific Specs Trigger Event and Messages
An HL7 Version 2.X Spec
Chapter-Specific Specs
Chapters 3, 4, 6, ...
Chapters
2 and 8
Common Specs
Trigger Event and Messages
Segments and Fields
1/25/99
© 1998,1999 Health Level 7