Health Level 7
Encyclopedia
Health Level Seven is an all-volunteer, non-profit organization
involved in development of international healthcare informatics interoperability standards. "HL7" is also used to refer to some of the specific standards created by the organization (e.g., HL7 v2.x, v3.0, HL7 RIM).
HL7 and its members provide a framework (and related standards) for the exchange, integration, sharing, and retrieval of electronic health information. v2.x of the standards, which support clinical practice and the management, delivery, and evaluation of health services, are the most commonly used in the world.
HL7 promotes the use of such informatics standards within and among healthcare organizations to increase the effectiveness and efficiency of healthcare information delivery for the benefit of all.
The HL7 community is organized in the form of a global organization (Health Level Seven, Inc.) and country-specific affiliate organizations:
The organizational structure of HL7 Inc. is as follows:
s. HL7, Inc. is a standards organization
that was accredited in 1994 by the American National Standards Institute
(ANSI).
HL7 is one of several American National Standards Institute accredited Standards Developing Organizations (SDOs) operating in the healthcare arena. Most SDOs produce standards (sometimes called specifications or protocols) for a particular healthcare domain such as pharmacy, medical devices, imaging or insurance (claims processing) transactions. Health Level Seven’s domain is clinical and administrative data.
Today, HL7 has been adopted by several national SDOs outside the United States. Those SDOs are consequently not accredited by ANSI. However, HL7 is now adopted by ISO as a centre of gravity in international standardization and accredited as a partnering organization for mutual issuing of standards. The first mutually published standard is ISO/HL7 21731:2006 Health informatics—HL7 version 3—Reference information model—Release 1.
also known as the application layer. The name indicates that HL7 focuses on application layer protocols for the health care domain, independent of lower layers. HL7 effectively considers all lower layers merely as tools.
), in both the healthcare and information infrastructure domains to promote the use of supportive and compatible standards. HL7 collaborates with healthcare information technology users to ensure that HL7 standards meet real-world requirements, and that appropriate standards development efforts are initiated by HL7 to meet emergent requirements.
About 45% of the global membership (of either HL7 Inc. or an HL7 affiliate) is located in Europe, 35% in North America, 15% in Asia-Oceania and 5% elsewhere.
HL7 develops conceptual standards (e.g., HL7 RIM), document standards (e.g., HL7 CDA
), application standards (e.g., HL7 CCOW
), and messaging standards (e.g., HL7 v2.x and v3.0). Messaging standards are particularly important because they define how information is packaged and communicated from one party to another. Such standards set the language, structure and data types required for seamless integration from one system to another.
HL7 encompasses the complete life cycle of a standards specification including the development, adoption, market recognition, utilization, and adherence. Business use of the HL7 standards requires a paid organizational membership in HL7, Inc. HL7 Members can access standards for free, and non-members can buy the standards from HL7 or ANSI.
The Reference Information Model (RIM) and the HL7 Development Framework (HDF) are the basis of the HL7 Version 3 standards development process. RIM is the representation of the HL7 clinical data (domains) and the life cycle of messages or groups of messages. HDF is a project to specify the processes and methodology used by all the HL7 committees for project initiation, requirements analysis, standard design, implementation, standard approval process, etc.
HL7 standards:
V2.x Messaging
HL7 version 2 defines a series of electronic messages to support administrative, logistical, financial as well as clinical processes. Since 1987 the standard has been updated regularly, resulting in versions 2.1, 2.2, 2.3, 2.3.1, 2.4, 2.5, 2.5.1 and 2.6. The v2.x standards are backward compatible
(i.e. a message based on version 2.3 will be understood by an application that supports version 2.6).
HL7 v2.x messages use a human-readable (ASCII
), non-XML
encoding syntax based on segments (line
s) and one-character delimiter
s. Segments have composites (field
s) separated by the composite delimiter. A composite can have sub-composites separated by the sub-composite delimiter, and sub-composites can have sub-sub-composites separated by the sub-sub-composite delimiter. The first field (composite) in each segment contains the 3-character segment name. Each segment of the message contains one specific category of information. Every message has MSH as its first segment, which includes a field that identifies the message type. The message type determines the expected segment names in the message. The segment names for a particular message type are specified by the segment grammar notation used in the HL7 standards.
HL7 v2.x has allowed for the interoperability
between electronic Patient Administration Systems (PAS), Electronic Practice Management (EPM) systems, Laboratory Information Systems (LIS), Dietary, Pharmacy and Billing systems as well as Electronic Medical Record
(EMR) or Electronic Health Record
(EHR) systems. Currently, HL7’s v2.x messaging standard is supported by every major medical information systems vendor in the United States.
RIM - ISO/HL7 21731
The Reference Information Model (RIM) is the cornerstone of the HL7 Version 3 development process and an essential part of the HL7 V3 development methodology. RIM expresses the data content needed in a specific clinical or administrative context and provides an explicit representation of the semantic and lexical connections that exist between the information carried in the fields of HL7 messages. The RIM is essential to increase precision and reduce implementation costs. Models are available.
HL7 Development Framework - ISO/HL7 27931
The HL7 Version 3 Development Framework (HDF) is a continuously evolving process that seeks to develop specifications that facilitate interoperability between healthcare systems. The HL7 RIM, vocabulary specifications, and model-driven process of analysis and design combine to make HL7 Version 3 one methodology for development of consensus-based standards for healthcare information system interoperability
. The HDF is the most current edition of the HL7 V3 development methodology.
The HDF not only documents messaging, but also the processes, tools, actors, rules, and artifacts relevant to development of all HL7 standard specifications. Eventually, the HDF will encompass all of the HL7 standard specifications, including any new standards resulting from analysis of electronic health record architectures and requirements.
HL7 specifications draw upon codes and vocabularies from a variety of sources. The V3 vocabulary work ensures that the systems implementing HL7 specifications have an unambiguous understanding of the code sources and code value domains they are using.
V3 Messaging
The HL7 version 3 messaging standard defines a series of electronic messages (called interactions) to support all healthcare workflows. HL7 v3 messages are based on an XML encoding syntax.
V3 Clinical Document Architecture - ISO 10781
The HL7 version 3 Clinical Document Architecture
(CDA) is an XML-based markup standard intended to specify the encoding, structure and semantics of clinical documents for exchange.
SAIF is a way of thinking about producing specifications that explicitly describe the governance, conformance, compliance, and behavioral semantics that are needed to achieve computable semantic working interoperability. The intended information transmission technology might use a messaging, document exchange, or services approach.
SAIF is the framework that is required to rationalize interoperability of other standards. SAIF is an architecture for achieving interoperability, but it is not a whole-solution design for enterprise architecture management.
is a language for encoding medical knowledge. HL7 adopted and oversees the standard beginning with Arden syntax 2.0. These Medical Logic Modules
(MLM
s) are used in the clinical setting as they can contain sufficient knowledge to make single medical decisions. They can produce alerts, diagnoses, and interpretations along with quality assurance function and administrative support. An MLM
must run on a computer that meets the minimum system requirements and has the correct program installed. Then, the MLM can give advice for when and where it is needed.
, or "Clinical Context Object Workgroup," is a standard protocol designed to enable disparate applications to share user context and patient context in real-time, and at the user-interface level. CCOW implementations typically require a CCOW vault system to manage user security between applications.
.
Australia was an early adopter of the HL7 V2.x standards, which are now ubiquitously used in Australian public and private healthcare organisations.
The localisation of the HL7 standards is undertaken in cooperation with the national standards body, Standards Australia.
HL7 Australia closely cooperates with the National E-Health Transition Authority (NEHTA).
Standards Collaborative.
Among it's support for domestic, and international activities are:
Notable HL7 implementations currently include Prince Edward Island's drug information system (DIS).
The Social Insurance Institution of Finland is building a national ePrescribing and
patient record archival service based on HL7 CDA R2 and V3 messages. Phased
deployment is scheduled for 2008-2011. Version 2 messaging is widely deployed in most
hospitals and healthcare centers. CDA R1 is used in sharing patient records on
a regional level.
Due to federal structure of operational administration in German healthcare, the standardization aspect is much behind the possibilities of the public economy and due to competitive interests in industry of low normative impact to healthcare information systems development. Currently HL7 in Germany operates as an informal cluster and collaborates with the national standardization body.
The voluntary membership in HL7 relies on personal interest and engagement of clinical users and mainly on industrial interest: Clinical memberships are in minority. There is low membership of governmental administration and thus low contribution to ongoing discussion e.g. on patient data records (EPA = elektronische Patientenakte) balancing data availability vs. data security. Impact on productivity for hospital information systems (called KIS = Krankenhaus-Informationssysteme in German) is of no importance yet, as the variability of HIS systems has not been challenged by HL7.
Governmental funding for a broader adoption of HL7 does yet not exist in Germany, neither on federal level nor in most of the regional governments.
HL7 Italia members are suppliers of health IT market. Some Italian regions, regional In-Houses, Governative Agencies, Public Research Institutes, local Hospital departments and individual IT professionals are HL7 Italia members.
AORTA is the Dutch national infrastructure for the exchange of data between healthcare providers. AORTA uses HL7 version 3 messages and documents as its core mechanism for information exchange. The initial specifications were created in 2003.
The Dutch Ministry of Health is working on a virtual national Electronic Patient Records (EPR) which will enable healthcare providers to share patient data. This development takes place in close collaboration with Nictiz, the National Information and Communication Technology Institute for Healthcare. Nictiz coordinates its efforts with regard to the usage of HL7 version 3 with the volunteers of HL7 the Netherlands.
Almost all hospitals use HL7 version 2 to support hospital-internal workflows. EDIfact is being used to support workflows involving general practitioners (GPs/PCPs). EDIfact will be slowly replaced by HL7 version 3.
HLH (a national project) is being carried out at School of Electrical Engineering and Computer Sciences of National University of Science and Technology and is supported by Government of Pakistan
with funds provided by National ICT R&D Fund. HLH basic theme is to target health care information exchange and interoperability using HL7 version 3. Though the penetration and use of HL7 in Pakistan is lower than the countries like US and that of Europe. But its getting popularity among the stakeholders in Pakistan. HLH Team members have been participating in HL7 International Working Group meetings and conferences for last two years. On Oct 1, 2010 HL7 International announced Pakistan Chapter formally at 24th Plenary and WGM in Cambridge USA. Pakistan is now the 37th affiliate of HL7 International around the world. HL7 Pakistan is now officially authorized to give memberships to local organizations along with other privileges like certification, training etc.
The Certification Commission for Healthcare Information Technology (CCHIT)
has developed an open-source program called Laika
to test EHR software for compliance with CCHIT interoperability standards.
HIPAA
HL7’s initial involvement in the Health Insurance Portability and Accountability Act
(HIPAA) legislation began in 1996 with the formation of the Attachments special interest group to standardize the supplemental information needed to support health care insurance, and other e-commerce transactions. The initial deliverable of this group was a set of six recommended Claims Attachments for the Notice of Proposed Rule Making (NPRM) process. Future attachment projects include, but are not limited to, Home Health, Skilled Nursing Facility, durable medical equipment
(DME), end stage renal disease
(ESRD), and Pre-Authorization and Referrals. The Attachment special interest group is responsible for implementing the Administrative Simplification provisions of HIPAA mandates, providing on-going support, and representing HL7 in the Designated Standards Maintenance Organization (DSMO) efforts. Its purpose is to encourage the use of HL7 for uniform implementation of this supplemental information. This SIG coordinates industry input to produce and maintain guides for HL7 messages that can stand alone or be embedded within ANSI X12 transactions.
based tools that can foster worldwide adoption of the HL7 standards
Non-profit organization
Nonprofit organization is neither a legal nor technical definition but generally refers to an organization that uses surplus revenues to achieve its goals, rather than distributing them as profit or dividends...
involved in development of international healthcare informatics interoperability standards. "HL7" is also used to refer to some of the specific standards created by the organization (e.g., HL7 v2.x, v3.0, HL7 RIM).
HL7 and its members provide a framework (and related standards) for the exchange, integration, sharing, and retrieval of electronic health information. v2.x of the standards, which support clinical practice and the management, delivery, and evaluation of health services, are the most commonly used in the world.
Organization
HL7 is an international community of healthcare subject matter experts and information scientists collaborating to create standards for the exchange, management and integration of electronic healthcare information.HL7 promotes the use of such informatics standards within and among healthcare organizations to increase the effectiveness and efficiency of healthcare information delivery for the benefit of all.
The HL7 community is organized in the form of a global organization (Health Level Seven, Inc.) and country-specific affiliate organizations:
- Health Level Seven, Inc. (HL7, Inc. ) is headquartered in Ann Arbor, MichiganAnn Arbor, MichiganAnn Arbor is a city in the U.S. state of Michigan and the county seat of Washtenaw County. The 2010 census places the population at 113,934, making it the sixth largest city in Michigan. The Ann Arbor Metropolitan Statistical Area had a population of 344,791 as of 2010...
. - HL7 affiliate organizations, not-for-profit organizations incorporated in local jurisdictions, exist in over 40 countries. The first affiliate organization was created in Germany in 1993.
The organizational structure of HL7 Inc. is as follows:
- The organization is managed by a Board of Directors, which comprises 10 elected positions and three appointed positions.
- The Chief Executive Officer (currently Charles Jaffe, MD, PhD) serves as an ex officio member of and reports to the Board of Directors. The Chief Technology Officer (currently John Quinn); and the Chief Operations Officer (currently Mark McDougall) report to the CEO and also serve as ex officio members on the Board of Directors.
- Members of HL7 are known collectively as "The Working Group". The Working Group is responsible for defining the HL7 standard protocol and is composed of Standing Administrative Committees and Working Groups.
- Standing Administrative committees focus on organizational or promotional activities, such as Education, Implementation, Marketing, Outreach Committee for Clinical Research, Publishing and Process Improvement and Tooling.
- Working groups are directly responsible for the content of the Standards, framing the actual language of the specifications.
Origin
HL7 was founded in 1987 to produce a standard for hospital information systemHospital information system
There are various titles and acronyms which all declare similar approaches to managing the information flow and storage in hospital routine services, as*Hospital Information System , or*Healthcare Information System, or...
s. HL7, Inc. is a standards organization
Standards organization
A standards organization, standards body, standards developing organization , or standards setting organization is any organization whose primary activities are developing, coordinating, promulgating, revising, amending, reissuing, interpreting, or otherwise producing technical standards that are...
that was accredited in 1994 by the American National Standards Institute
American National Standards Institute
The American National Standards Institute is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. The organization also coordinates U.S. standards with international...
(ANSI).
HL7 is one of several American National Standards Institute accredited Standards Developing Organizations (SDOs) operating in the healthcare arena. Most SDOs produce standards (sometimes called specifications or protocols) for a particular healthcare domain such as pharmacy, medical devices, imaging or insurance (claims processing) transactions. Health Level Seven’s domain is clinical and administrative data.
Today, HL7 has been adopted by several national SDOs outside the United States. Those SDOs are consequently not accredited by ANSI. However, HL7 is now adopted by ISO as a centre of gravity in international standardization and accredited as a partnering organization for mutual issuing of standards. The first mutually published standard is ISO/HL7 21731:2006 Health informatics—HL7 version 3—Reference information model—Release 1.
The name "Health Level-7"
The name "Health Level-7" is a reference to the seventh layer of the ISO OSI Reference modelOSI model
The Open Systems Interconnection model is a product of the Open Systems Interconnection effort at the International Organization for Standardization. It is a prescription of characterizing and standardizing the functions of a communications system in terms of abstraction layers. Similar...
also known as the application layer. The name indicates that HL7 focuses on application layer protocols for the health care domain, independent of lower layers. HL7 effectively considers all lower layers merely as tools.
Collaboration
HL7 collaborates with other standards development organizations and national and international sanctioning bodies (e.g. ANSI and ISOInternational Organization for Standardization
The International Organization for Standardization , widely known as ISO, is an international standard-setting body composed of representatives from various national standards organizations. Founded on February 23, 1947, the organization promulgates worldwide proprietary, industrial and commercial...
), in both the healthcare and information infrastructure domains to promote the use of supportive and compatible standards. HL7 collaborates with healthcare information technology users to ensure that HL7 standards meet real-world requirements, and that appropriate standards development efforts are initiated by HL7 to meet emergent requirements.
About 45% of the global membership (of either HL7 Inc. or an HL7 affiliate) is located in Europe, 35% in North America, 15% in Asia-Oceania and 5% elsewhere.
HL7 standards
Hospitals and other healthcare provider organizations typically have many different computer systems used for everything from billing records to patient tracking. All of these systems should communicate with each other (or "interface") when they receive new information but not all do so. HL7 specifies a number of flexible standards, guidelines, and methodologies by which various healthcare systems can communicate with each other. Such guidelines or data standards are a set of rules that allow information to be shared and processed in a uniform and consistent manner. These data standards are meant to allow healthcare organizations to easily share clinical information. Theoretically, this ability to exchange information should help to minimize the tendency for medical care to be geographically isolated and highly variable.HL7 develops conceptual standards (e.g., HL7 RIM), document standards (e.g., HL7 CDA
Clinical Document Architecture
The HL7 Clinical Document Architecture is an XML-based markup standard intended to specify the encoding, structure and semantics of clinical documents for exchange.CDA is part of the HL7 version 3 standard...
), application standards (e.g., HL7 CCOW
CCOW
In the context of Health informatics, CCOW or Clinical Context Object Workgroup is an HL7 standard protocol designed to enable disparate applications to synchronize in real-time, and at the user-interface level...
), and messaging standards (e.g., HL7 v2.x and v3.0). Messaging standards are particularly important because they define how information is packaged and communicated from one party to another. Such standards set the language, structure and data types required for seamless integration from one system to another.
HL7 encompasses the complete life cycle of a standards specification including the development, adoption, market recognition, utilization, and adherence. Business use of the HL7 standards requires a paid organizational membership in HL7, Inc. HL7 Members can access standards for free, and non-members can buy the standards from HL7 or ANSI.
The Reference Information Model (RIM) and the HL7 Development Framework (HDF) are the basis of the HL7 Version 3 standards development process. RIM is the representation of the HL7 clinical data (domains) and the life cycle of messages or groups of messages. HDF is a project to specify the processes and methodology used by all the HL7 committees for project initiation, requirements analysis, standard design, implementation, standard approval process, etc.
HL7 standards:
- Version 2.x Messaging Standard – an interoperability specification for health and medical transactions
- Version 3 Messaging Standard – an interoperability specification for health and medical transactions, based on RIM
- Version 3 Rules/GELLOGello Expression LanguageThe GELLO Expression Language was started in 2001 and introduced in 2002; in 2005, GELLO was adopted as an international standard by HL7 International and ANSI for a decision support language...
– a standard expression language used for clinical decision support - Arden SyntaxArden SyntaxThe Arden syntax is an artificial intelligence frame-based grammar for representing and processing medical conditions and recommendations as "Medical Logic Modules ", used in Medical algorithms....
– a grammar for representing medical conditions and recommendations as a Medical Logic ModuleMedical Logic ModuleA medical logic module is an independent unit in a healthcare knowledge base that represents the knowledge published on a requirement for treating a patient according to a single medical decision....
(MLM) - Clinical Context Object Workgroup (CCOW) – an interoperability specification for the visual integration of user applications
- Claims Attachments – a Standard Healthcare Attachment to augment another healthcare transaction
- Clinical Document ArchitectureClinical Document ArchitectureThe HL7 Clinical Document Architecture is an XML-based markup standard intended to specify the encoding, structure and semantics of clinical documents for exchange.CDA is part of the HL7 version 3 standard...
(CDA) – an exchange model for clinical documents, based on HL7 Version 3 - Electronic Health RecordElectronic Health RecordAn electronic health record is an evolving concept defined as a systematic collection of electronic health information about individual patients or populations...
(EHR) / Personal Health RecordPersonal health recordA personal health record or PHR is a health record where health data is curated by an individual user themselves. This stands in contrast with the more widely used electronic medical record which is held by institutions such as a hospital and contains data entered by clinicians or billing data in...
(PHR) – in support of these records, a standardized description of health and medical functions sought for or available - Structured Product LabelingStructured Product LabelingStructured Product Labeling defines the content of human prescription drug labeling in an XML format This format is defined within the SPL schema and is displayed in a web browser using the SPL stylesheet...
(SPL) – the published information that accompanies a medicine, based on HL7 Version 3
HL7 version 2.x
The HL7 version 2 standard has the aim to support hospital workflows. It was originally created in 1989.V2.x Messaging
HL7 version 2 defines a series of electronic messages to support administrative, logistical, financial as well as clinical processes. Since 1987 the standard has been updated regularly, resulting in versions 2.1, 2.2, 2.3, 2.3.1, 2.4, 2.5, 2.5.1 and 2.6. The v2.x standards are backward compatible
Backward compatibility
In the context of telecommunications and computing, a device or technology is said to be backward or downward compatible if it can work with input generated by an older device...
(i.e. a message based on version 2.3 will be understood by an application that supports version 2.6).
HL7 v2.x messages use a human-readable (ASCII
ASCII
The American Standard Code for Information Interchange is a character-encoding scheme based on the ordering of the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that use text...
), non-XML
XML
Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....
encoding syntax based on segments (line
Line (text file)
In computing, a line is a unit of organization for text files. A line consists of a sequence of zero or more characters, usually displayed within a single horizontal sequence....
s) and one-character delimiter
Delimiter
A delimiter is a sequence of one or more characters used to specify the boundary between separate, independent regions in plain text or other data streams. An example of a delimiter is the comma character, which acts as a field delimiter in a sequence of comma-separated values.Delimiters represent...
s. Segments have composites (field
Field (computer science)
In computer science, data that has several parts can be divided into fields. Relational databases arrange data as sets of database records, also called rows. Each record consists of several fields; the fields of all records form the columns....
s) separated by the composite delimiter. A composite can have sub-composites separated by the sub-composite delimiter, and sub-composites can have sub-sub-composites separated by the sub-sub-composite delimiter. The first field (composite) in each segment contains the 3-character segment name. Each segment of the message contains one specific category of information. Every message has MSH as its first segment, which includes a field that identifies the message type. The message type determines the expected segment names in the message. The segment names for a particular message type are specified by the segment grammar notation used in the HL7 standards.
HL7 v2.x has allowed for the interoperability
Interoperability
Interoperability is a property referring to the ability of diverse systems and organizations to work together . The term is often used in a technical systems engineering sense, or alternatively in a broad sense, taking into account social, political, and organizational factors that impact system to...
between electronic Patient Administration Systems (PAS), Electronic Practice Management (EPM) systems, Laboratory Information Systems (LIS), Dietary, Pharmacy and Billing systems as well as Electronic Medical Record
Electronic medical record
An electronic medical record is a computerized medical record created in an organization that delivers care, such as a hospital or physician's office...
(EMR) or Electronic Health Record
Electronic Health Record
An electronic health record is an evolving concept defined as a systematic collection of electronic health information about individual patients or populations...
(EHR) systems. Currently, HL7’s v2.x messaging standard is supported by every major medical information systems vendor in the United States.
HL7 version 3
The HL7 version 3 standard has the aim to support all healthcare workflows. Development of version 3 started around 1995, resulting in an initial standard publication in 2005. The v3 standard, as opposed to version 2, is based on a formal methodology (the HDF) and object-oriented principles.RIM - ISO/HL7 21731
The Reference Information Model (RIM) is the cornerstone of the HL7 Version 3 development process and an essential part of the HL7 V3 development methodology. RIM expresses the data content needed in a specific clinical or administrative context and provides an explicit representation of the semantic and lexical connections that exist between the information carried in the fields of HL7 messages. The RIM is essential to increase precision and reduce implementation costs. Models are available.
HL7 Development Framework - ISO/HL7 27931
The HL7 Version 3 Development Framework (HDF) is a continuously evolving process that seeks to develop specifications that facilitate interoperability between healthcare systems. The HL7 RIM, vocabulary specifications, and model-driven process of analysis and design combine to make HL7 Version 3 one methodology for development of consensus-based standards for healthcare information system interoperability
Interoperability
Interoperability is a property referring to the ability of diverse systems and organizations to work together . The term is often used in a technical systems engineering sense, or alternatively in a broad sense, taking into account social, political, and organizational factors that impact system to...
. The HDF is the most current edition of the HL7 V3 development methodology.
The HDF not only documents messaging, but also the processes, tools, actors, rules, and artifacts relevant to development of all HL7 standard specifications. Eventually, the HDF will encompass all of the HL7 standard specifications, including any new standards resulting from analysis of electronic health record architectures and requirements.
HL7 specifications draw upon codes and vocabularies from a variety of sources. The V3 vocabulary work ensures that the systems implementing HL7 specifications have an unambiguous understanding of the code sources and code value domains they are using.
V3 Messaging
The HL7 version 3 messaging standard defines a series of electronic messages (called interactions) to support all healthcare workflows. HL7 v3 messages are based on an XML encoding syntax.
V3 Clinical Document Architecture - ISO 10781
The HL7 version 3 Clinical Document Architecture
Clinical Document Architecture
The HL7 Clinical Document Architecture is an XML-based markup standard intended to specify the encoding, structure and semantics of clinical documents for exchange.CDA is part of the HL7 version 3 standard...
(CDA) is an XML-based markup standard intended to specify the encoding, structure and semantics of clinical documents for exchange.
Services Aware Interoperability Framework
The HL7 Services-Aware Enterprise Architecture Framework (SAIF) provides consistency between all HL7 artifacts, and enables a standardized approach to Enterprise Architecture (EA) development and implementation, and a way to measure the consistency.SAIF is a way of thinking about producing specifications that explicitly describe the governance, conformance, compliance, and behavioral semantics that are needed to achieve computable semantic working interoperability. The intended information transmission technology might use a messaging, document exchange, or services approach.
SAIF is the framework that is required to rationalize interoperability of other standards. SAIF is an architecture for achieving interoperability, but it is not a whole-solution design for enterprise architecture management.
Arden syntax
The Arden syntaxArden Syntax
The Arden syntax is an artificial intelligence frame-based grammar for representing and processing medical conditions and recommendations as "Medical Logic Modules ", used in Medical algorithms....
is a language for encoding medical knowledge. HL7 adopted and oversees the standard beginning with Arden syntax 2.0. These Medical Logic Modules
Medical Logic Module
A medical logic module is an independent unit in a healthcare knowledge base that represents the knowledge published on a requirement for treating a patient according to a single medical decision....
(MLM
Medical Logic Module
A medical logic module is an independent unit in a healthcare knowledge base that represents the knowledge published on a requirement for treating a patient according to a single medical decision....
s) are used in the clinical setting as they can contain sufficient knowledge to make single medical decisions. They can produce alerts, diagnoses, and interpretations along with quality assurance function and administrative support. An MLM
Medical Logic Module
A medical logic module is an independent unit in a healthcare knowledge base that represents the knowledge published on a requirement for treating a patient according to a single medical decision....
must run on a computer that meets the minimum system requirements and has the correct program installed. Then, the MLM can give advice for when and where it is needed.
MLLP
A large portion of HL7 messaging is transported by Minimal Lower Layer Protocol (MLLP), also known as Lower Layer Protocol (LLP). For transmitting via TCP/IP, header and trailer characters are added to the message to identify the beginning and ending of the message because TCP/IP is a continuous stream of bytes. Hybrid Lower Layer Protocol (HLLP) is a variation of MLLP that includes a checksum to help verify message integrity. Amongst other software vendors, MLLP is supported by Microsoft and Oracle.CCOW
CCOWCCOW
In the context of Health informatics, CCOW or Clinical Context Object Workgroup is an HL7 standard protocol designed to enable disparate applications to synchronize in real-time, and at the user-interface level...
, or "Clinical Context Object Workgroup," is a standard protocol designed to enable disparate applications to share user context and patient context in real-time, and at the user-interface level. CCOW implementations typically require a CCOW vault system to manage user security between applications.
Functional EHR and PHR specifications
Functional specifications for an electronic health recordElectronic Health Record
An electronic health record is an evolving concept defined as a systematic collection of electronic health information about individual patients or populations...
.
Australia
HL7 Australia was established in 1998.Australia was an early adopter of the HL7 V2.x standards, which are now ubiquitously used in Australian public and private healthcare organisations.
The localisation of the HL7 standards is undertaken in cooperation with the national standards body, Standards Australia.
HL7 Australia closely cooperates with the National E-Health Transition Authority (NEHTA).
Canada
HL7 within Canada is supported by the HL7 Canadian Constituency, which is hosted by the Canadian Health InfowayCanada Health Infoway
Canada Health Infoway is an independent, federally-funded, not-for-profit organization tasked with accelerating the development of electronic health records across Canada. As a strategic investor, they work with Canadian provinces and territories with the goal of creating an electronic health...
Standards Collaborative.
Among it's support for domestic, and international activities are:
- Liaising with HL7 International;
- Supporting communication and correspondence domestically and international for specific HL7 items;
- Responding to inquiries from HL7 International;
- Planning and execution of HL7 Canada Constituency roles and responsibilities;
- Supporting domestic and international HL7 Canada meetings;
- Providing support to domestic input on international HL7 ballot and comment items; and
- Administering the HL7 Canada Constituency forum to facilitate member collaboration.
Notable HL7 implementations currently include Prince Edward Island's drug information system (DIS).
Finland
National IT services for healthcareThe Social Insurance Institution of Finland is building a national ePrescribing and
patient record archival service based on HL7 CDA R2 and V3 messages. Phased
deployment is scheduled for 2008-2011. Version 2 messaging is widely deployed in most
hospitals and healthcare centers. CDA R1 is used in sharing patient records on
a regional level.
Germany
The German chapter of HL7 was founded in 1993. This is an entity for benefit to the public and registered as an association as HL7 e. V.Due to federal structure of operational administration in German healthcare, the standardization aspect is much behind the possibilities of the public economy and due to competitive interests in industry of low normative impact to healthcare information systems development. Currently HL7 in Germany operates as an informal cluster and collaborates with the national standardization body.
The voluntary membership in HL7 relies on personal interest and engagement of clinical users and mainly on industrial interest: Clinical memberships are in minority. There is low membership of governmental administration and thus low contribution to ongoing discussion e.g. on patient data records (EPA = elektronische Patientenakte) balancing data availability vs. data security. Impact on productivity for hospital information systems (called KIS = Krankenhaus-Informationssysteme in German) is of no importance yet, as the variability of HIS systems has not been challenged by HL7.
Governmental funding for a broader adoption of HL7 does yet not exist in Germany, neither on federal level nor in most of the regional governments.
Italy
HL7 Italia was established in 2003 and it is responsible for the localization of this standard in the Italian context. The aim is to stimulate and direct the regional and national contributions towards the standard development and to promote the modernization of Italian health IT.HL7 Italia members are suppliers of health IT market. Some Italian regions, regional In-Houses, Governative Agencies, Public Research Institutes, local Hospital departments and individual IT professionals are HL7 Italia members.
The Netherlands
AORTA - National Healthcare ICT infrastructureAORTA is the Dutch national infrastructure for the exchange of data between healthcare providers. AORTA uses HL7 version 3 messages and documents as its core mechanism for information exchange. The initial specifications were created in 2003.
The Dutch Ministry of Health is working on a virtual national Electronic Patient Records (EPR) which will enable healthcare providers to share patient data. This development takes place in close collaboration with Nictiz, the National Information and Communication Technology Institute for Healthcare. Nictiz coordinates its efforts with regard to the usage of HL7 version 3 with the volunteers of HL7 the Netherlands.
Almost all hospitals use HL7 version 2 to support hospital-internal workflows. EDIfact is being used to support workflows involving general practitioners (GPs/PCPs). EDIfact will be slowly replaced by HL7 version 3.
Pakistan
HLH - Health Life HorizonHLH (a national project) is being carried out at School of Electrical Engineering and Computer Sciences of National University of Science and Technology and is supported by Government of Pakistan
Pakistan
Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...
with funds provided by National ICT R&D Fund. HLH basic theme is to target health care information exchange and interoperability using HL7 version 3. Though the penetration and use of HL7 in Pakistan is lower than the countries like US and that of Europe. But its getting popularity among the stakeholders in Pakistan. HLH Team members have been participating in HL7 International Working Group meetings and conferences for last two years. On Oct 1, 2010 HL7 International announced Pakistan Chapter formally at 24th Plenary and WGM in Cambridge USA. Pakistan is now the 37th affiliate of HL7 International around the world. HL7 Pakistan is now officially authorized to give memberships to local organizations along with other privileges like certification, training etc.
USA
LaikaThe Certification Commission for Healthcare Information Technology (CCHIT)
Certification Commission for Healthcare Information Technology
The Certification Commission for Health Information Technology is an independent, 5013 nonprofit organization with the public mission of accelerating the adoption of robust, interoperable health information technology...
has developed an open-source program called Laika
Laika (EHR Testing Framework)
Laika is an open source Electronic Health Record testing framework. Laika analyzes and reports on the interoperability capabilities of EHR systems. This includes the testing for certification of EHR software products and networks...
to test EHR software for compliance with CCHIT interoperability standards.
HIPAA
HL7’s initial involvement in the Health Insurance Portability and Accountability Act
Health Insurance Portability and Accountability Act
The Health Insurance Portability and Accountability Act of 1996 was enacted by the U.S. Congress and signed by President Bill Clinton in 1996. It was originally sponsored by Sen. Edward Kennedy and Sen. Nancy Kassebaum . Title I of HIPAA protects health insurance coverage for workers and their...
(HIPAA) legislation began in 1996 with the formation of the Attachments special interest group to standardize the supplemental information needed to support health care insurance, and other e-commerce transactions. The initial deliverable of this group was a set of six recommended Claims Attachments for the Notice of Proposed Rule Making (NPRM) process. Future attachment projects include, but are not limited to, Home Health, Skilled Nursing Facility, durable medical equipment
Durable medical equipment
Durable medical equipment is a term of art used to describe any medical equipment used in the home to aid in a better quality of living. It is a benefit included in most insurances. In some cases certain Medicare benefits, that is, whether Medicare may pay for the item...
(DME), end stage renal disease
End stage renal disease
End stage renal disease may refer to:* End-stage renal disease, also known as chronic kidney disease , specifically the fifth stage of CKD...
(ESRD), and Pre-Authorization and Referrals. The Attachment special interest group is responsible for implementing the Administrative Simplification provisions of HIPAA mandates, providing on-going support, and representing HL7 in the Designated Standards Maintenance Organization (DSMO) efforts. Its purpose is to encourage the use of HL7 for uniform implementation of this supplemental information. This SIG coordinates industry input to produce and maintain guides for HL7 messages that can stand alone or be embedded within ANSI X12 transactions.
See also
- Clinical Document Architecture (CDA)Clinical Document ArchitectureThe HL7 Clinical Document Architecture is an XML-based markup standard intended to specify the encoding, structure and semantics of clinical documents for exchange.CDA is part of the HL7 version 3 standard...
- CDISCClinical Data Interchange Standards ConsortiumClinical Data Interchange Standards Consortium is a non-profit organization, whose mission is "to develop and support global, platform-independent data standards that enable information system interoperability to improve medical research and related areas of health-care". Their main project, the...
- DICOM
- Electronic medical recordElectronic medical recordAn electronic medical record is a computerized medical record created in an organization that delivers care, such as a hospital or physician's office...
- eHealthEHealtheHealth is a relatively recent term for healthcare practice supported by electronic processes and communication, dating back to at least 1999...
- EHRcom
- European Institute for Health RecordsEuropean Institute for Health RecordsThe European Institute for Health Records or EuroRec Institute is a non-profit organization founded in 2002 as part of the ProRec initiative. On 13 May 2003, the institute was established as a non-profit organization under French law. Current President of EuroRec is Prof. Georges De Moor...
(European UnionEuropean UnionThe European Union is an economic and political union of 27 independent member states which are located primarily in Europe. The EU traces its origins from the European Coal and Steel Community and the European Economic Community , formed by six countries in 1958...
) - Gello Expression LanguageGello Expression LanguageThe GELLO Expression Language was started in 2001 and introduced in 2002; in 2005, GELLO was adopted as an international standard by HL7 International and ANSI for a decision support language...
- Health InformaticsHealth informatics.Health informatics is a discipline at the intersection of information science, computer science, and health care...
- Health Informatics Service Architecture (HISA)
- Healthcare Services Specification ProjectHealthcare Services Specification ProjectThe Healthcare Services Specification Project is a standards development effort to create health industry service oriented architecture standards supportive of the health care market sector. HSSP is a jointly sponsored activity operating within the Health Level Seven and the Object Management...
(HSSP) - HL7 SAIFHL7 Services Aware Interoperability FrameworkThis article documents the effort of the Health Level Seven community and specifically the HL7 Architecture Board to develop an interoperability framework that would support services, messages, and Clinical Document Architecture ISO 10871....
- IHEIntegrating the Healthcare EnterpriseIHE is an initiative by healthcare professionals and industry to improve the way computer systems in healthcare share information.In 1997, a consortium of radiologists and information technology experts formed IHE, or "Integrating the Healthcare Enterprise." IHE created and operates a process...
- ISO TC 215
- LOINCLOINCLogical Observation Identifiers Names and Codes is a database and universal standard for identifying medical laboratory observations. It was developed and is maintained by the Regenstrief Institute, a US non-profit medical research organization, in 1994...
- Mirth (software)Mirth (software)Mirth is an open source cross-platform HL7 interface engine that enables bi-directional sending of HL7 messages between systems and applications over multiple transports available under the Mozilla Public License 1.1 license.-Background:...
- openEHR FoundationOpenehropenEHR is an open standard specification in health informatics that describes the management and storage, retrieval and exchange of health data in electronic health records . In openEHR, all health data for a person is stored in a "one lifetime", vendor-independent, person-centred EHR...
- Public Health Information NetworkPublic Health Information NetworkThe Public Health Information Network is a national initiative, developed by the Centers for Disease Control and Prevention , for advancing fully capable and interoperable information systems in public health organizations...
- SNOMED, SNOMED CTSNOMED CTSNOMED CT , is a systematically organised computer processable collection of medical terminology covering most areas of clinical information such as diseases, findings, procedures, microorganisms, substances, etc...
External links
- HL7 Standards
- HL7.org site
- Introduction to HL7
- How does HL7 work? (Video Introduction)
- HL7.org EHR Page
- What does HL7 enablement means?
- HL7 is a member of the Joint Initiative on SDO Global Health Informatics Standardization
- HL7 Tools Page
- Australian Healthcare Messaging Laboratory (AHML) - Online HL7 Message Testing and Certification
- Comprehensive Implementation of HL7 v3 Specifications in Java
- HL7 Programming Tutorial using Java
- HL7 101: A Beginner’s Guide
- International HL7 Experts Consortium
- The Healthcare IT Interoperability Blog
- NIST HL7 Conformance Testing Framework
- ICH-HL7 Regulated Product Submissions
Critical reviews
- HL7 RIM: An Incoherent Standard and The HL7 RIM Under Scrutiny - rebuttal
- HL7 Watch – Blog; critical review of HL7. See also the posted comments for attempted rebuttals to some of the earlier posts.
Open source tools
There are a number of FOSSFoss
Foss may refer toPeople*Foss , people with the last name Foss*Foss Shanahan , New Zealand diplomat*Foss Westcott , English bishop...
based tools that can foster worldwide adoption of the HL7 standards
- Mirth Connect, an Open Source HL7 Integration Engine for HL7 V2/V3, DICOM, NCPDP and X12. Freely available under MPL 1.1 license
- The open health tools consortium
- The HL7 Java Special Interest Group's implementation of HL7 v3
- The Eclipse OHF project - v2 and v3 implementations (IDE type tools and run-time libraries)
- HAPI, An open-source, object-oriented HL7 2.x parser for Java
- The Perl HL7 Toolkit, an Open-Source HL7 Perl module
- Pear (PHP) HL7 messaging API module
- The eXcessively Simple HL7 v2 Processing Platform using XML and XSLT
- The Ruby HL7 Library
- HL7 Java binding
- nule.org HL7 Utilities
- nHAPI open-source library for .NET
- HL7v3 Messaging Framework for .NET
- HL7 Analyst for .NET
- HL7Kit Free Sender, HL7 Message Editor and Sender