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HL7 Overview Gliwice January 10 th , 2009

HL7 Overview Gliwice January 10 th , 2009 . Agenda. What is HL7? HL7 in Healthcare Management Systems Message structure Message encoding schemes HL7 tools. What is HL7 (Health Level Seven) ?. Protocol for data exchange between computer systems in health care environments.

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HL7 Overview Gliwice January 10 th , 2009

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  1. HL7 Overview Gliwice January 10th, 2009

  2. Agenda • What is HL7? • HL7 in Healthcare ManagementSystems • Message structure • Message encoding schemes • HL7 tools

  3. What is HL7 (Health Level Seven)? • Protocol for data exchange between computersystems in health care environments. • Defines messages as they are exchanged and the procedures used for exchanging them. • Refers to the top layer (Level 7) of OSI/ISO layer model (see next slide). • ANSI standard since 1997 most widely used in USA, Canada, Australia, New Zealand and Japan.

  4. What is HL7 (Health Level Seven)? Type of network communication (e-mail, telnet, FTP, HL7) Application 7 Presentation Data conversion, encryption 6 Controlling dialogues (sessions). Establishing, terminating and restarting connection. Session 5 Transport 4 Routing, reliable data transport between two computers TCP/IP Network 3 Network adapter: Ethernet, wireless Ethernet Data-Link 2 Physical link: Ethernet cable, RS-232, optical link Physical 1

  5. What is HL7 (Health Level Seven)? HL7 contains message standards covering: • Patient Administration • Orders for Clinical Services and Observations, Pharmacy, Nutrition and Supplies order entry • Patient Accounting and Charges • Observation Reporting • Document Management Services • Appointment Scheduling • Laboratory Automation • Personnel Management • …

  6. Agenda • What is HL7? • HL7 in Healthcare ManagementSystems • Message structure • Message encoding schemes • HL7 tools

  7. HL7 in HealthcareManagement System

  8. Agenda • What is HL7? • HL7 in Healthcare ManagementSystems • Message structure • Message encoding schemes • HL7 tools

  9. Message structure • HL7 messages are made up of segments • Segments are units that comprise messages. • A segment is defined as a sequence of fields. • Both segments and fields may appear more than once in a message. • Examples of HL7 message segments: • MSH - Message Header information about a message • EVN - Event Type event information • PID - Patient Identification information about a patient • NK1 - Next of Kin information about the patient's other related parties • OBR - Observation Request information about an order • OBX - Observation Report information about a result

  10. Message structure HL7 Message Example

  11. Message structure • Types of messages • Most applicable HL7 messages for communicating HIS and diagnostic systems: • ACK – General Acknowledgment message • ORM – General Order message • ORR – General Order Response message • ORU – Unsolicited Transmission of Observation

  12. Message structure • Data Exchange • No data exchange, messaging and communication technologies are determined by HL7. • Frequently used protocols in HL7 implementations: • LLP (Lower Layer Protocol) – TCP/IP based • SOAP (Simple Object Access Protocol) – XML based • Batch Files – messages in text files exchanged by FTP and SMTP or offline via a tape or a diskette

  13. Agenda • What is HL7? • HL7 in Healthcare ManagementSystems • Message structure • Message encoding schemes • HL7 tools

  14. Message encoding schemes HL7 uses two encoding schemes: • HL7 ER, also known as 'traditional' HL7 format; • used for HL7 versions 2.x • XML • primary encoding scheme for HL7 v 3.0 • can be used for HL7 v 2.x in environments wheresender and receiver both understand XML

  15. Message encoding schemes HL7 ER Sample message encoded in HL7 ER format

  16. Message encoding schemes XML Sample message encoded using XML scheme <!DOCTYPE ACK SYSTEM "hl7_v231.dtd"> <ACK> <MSH> <MSH.1>|</MSH.1> <MSH.2>^~\&amp;</MSH.2> <MSH.3> <HD.1>LAB</HD.1> <HD.2>foo</HD.2> <HD.3>bar</HD.3> </MSH.3> <MSH.4><HD.1>767543</HD.1></MSH.4> <MSH.5><HD.1>ADT</HD.1></MSH.5> <MSH.6><HD.1>767543</HD.1></MSH.6> <MSH.7>19900314130405</MSH.7> ... ... </MSH>

  17. Message encoding schemes • HL7 is not Plug & Play • Some vendors do not follow HL7 rules close enough. • The same data could be placed in different segments of different HL7 implementations. • Not all data types may be coded using standardHL7 format. For these types vendor specific messages and fields must be used. • When deploying system utilizing HL7 interface, it still must be adapted to hospital-specific requirements.

  18. Agenda • What is HL7? • HL7 in Healthcare ManagementSystems • Message structure • Message encoding schemes • HL7 tools

  19. HL7 tools There are many HL7 tools assisting developers inthe following areas: • Parsing and converting messages. • Validating messages in accordance with HL7 standard and user-defined rules. • Simulating HL7 message sender (e.g. HIS) for diagnostic purposes. • Networking features required for HL7: TCP/IP sockets, FTP, SOAP, other.

  20. HL7 tools • Chameleon, Iguana, Interfacewarehttp://www.interfaceware.com • ProtoGen/HL7http://aurora.regenstrief.org/~gunther • BizTalk Server and BizTalk Accelerator for HL7http://www.microsoft.com/biztalk/evaluation/hl7/default.mspx

  21. Many thanks for your attention! Iwona Machowska Marketing & New Business ManagerTel. +48 600 375 376Email: iwona.machowska@codeconcept.pl Ul. Toszecka 101/22244-100 Gliwice, PolandTel. 48 32 23 00 290www.codeconcept.pl

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