hl7 overview gliwice january 10 th, 2009. what is hl7? hl7 in healthcare management systems ...
TRANSCRIPT
HL7 Overview
GliwiceJanuary 10th, 2009
What is HL7? HL7 in Healthcare Management Systems Message structure Message encoding schemes HL7 tools
Agenda
• Protocol for data exchange between computer systems 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.
What is HL7 (Health Level Seven)?
What is HL7 (Health Level Seven)?
Application Type of network communication(e-mail, telnet, FTP, HL7)
Data conversion, encryptionPresentation
SessionControlling dialogues (sessions). Establishing, terminating and restarting connection.
Transport
Network
Data-Link
Physical
Network adapter: Ethernet, wireless Ethernet
Physical link: Ethernet cable, RS-232, optical link
TCP/IPRouting, reliable data transport between two computers
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• …
What is HL7? HL7 in Healthcare Management Systems Message structure Message encoding schemes HL7 tools
Agenda
HL7 in HealthcareManagement System
What is HL7? HL7 in Healthcare Management Systems Message structure Message encoding schemes HL7 tools
Agenda
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
Message structure
HL7 Message Example
Message structure
Types of messagesMost 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
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 basedSOAP (Simple Object Access Protocol) – XML
basedBatch Files – messages in text files exchanged
by FTP and SMTP or offline via a tape or a diskette
What is HL7? HL7 in Healthcare Management Systems Message structure Message encoding schemes HL7 tools
Agenda
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
where sender and receiver both understand XML
Message encoding schemes
HL7 ER
Sample message encoded in HL7 ER format
Message encoding schemes
XMLSample message encoded using XML scheme
<!DOCTYPE ACK SYSTEM "hl7_v231.dtd">
<ACK>
<MSH>
<MSH.1>|</MSH.1>
<MSH.2>^~\&</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>
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 standard
HL7 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.
What is HL7? HL7 in Healthcare Management Systems Message structure Message encoding schemes HL7 tools
Agenda
HL7 tools
There are many HL7 tools assisting developers in the 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.
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
Many thanks for your attention!
Iwona Machowska
Marketing & New Business ManagerEmail: [email protected]
Ul. Toszecka 10144-100 Gliwice, Poland
Tel. 48 32 23 00 290www.codeconcept.pl