What is HL7? Health Level Seven is one of several American National Standards Institute (ANSI) -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. Headquartered in Ann Arbor, MI , Health Level Seven is like most of the other SDOs in that it is a not-for-profit volunteer organization. Its members-- providers, vendors, payers, consultants, government groups and others who have an interest in the development and advancement of clinical and administrative standards for healthcare—develop the standards. Like all ANSI-accredited SDOs, Health Level Seven adheres to a strict and well-defined set of operating procedures that ensures consensus, openness and balance of interest. A frequent misconception about Health Level Seven (and presumably about the other SDOs) is that it develops software. In reality, Health Level Seven develops specifications, the most widely used being a messaging standard that enables disparate healthcare applications to exchange keys sets of clinical and administrative data. Members of Health Level Seven are known collectively as the Working Group, which is organized into technical committees and special interest groups. The technical committees are directly responsible for the content of the Standards. Special interest groups serve as a test bed for exploring new areas that may need coverage in HL7’s published standards. A list of the technical committees and special interest groups as well as their missions, scopes and current leadership is available on this web site. HL7's Vision To create the best and most widely used standards in healthcare. HL7's Mission HL7 provides standards for interoperability that improve care delivery, optimize workflow, reduce ambiguity and enhance knowledge transfer among all of our stakeholders, including healthcare providers, government agencies, the vendor community, fellow SDOs and patients. In all of our processes we exhibit timeliness, scientific rigor and technical expertise without compromising transparency, accountability,
Transcript
What is HL7?
Health Level Seven is one of several American National Standards Institute (ANSI) -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.
Headquartered in Ann Arbor, MI, Health Level Seven is like most of the other SDOs in that it is a not-for-profit volunteer organization. Its members-- providers, vendors, payers, consultants, government groups and others who have an interest in the development and advancement of clinical and administrative standards for healthcare—develop the standards. Like all ANSI-accredited SDOs, Health Level Seven adheres to a strict and well-defined set of operating procedures that ensures consensus, openness and balance of interest. A frequent misconception about Health Level Seven (and presumably about the other SDOs) is that it develops software. In reality, Health Level Seven develops specifications, the most widely used being a messaging standard that enables disparate healthcare applications to exchange keys sets of clinical and administrative data.
Members of Health Level Seven are known collectively as the Working Group, which is organized into technical committees and special interest groups. The technical committees are directly responsible for the content of the Standards. Special interest groups serve as a test bed for exploring new areas that may need coverage in HL7’s published standards. A list of the technical committees and special interest groups as well as their missions, scopes and current leadership is available on this web site.
HL7's Vision
To create the best and most widely used standards in healthcare.
HL7's Mission
HL7 provides standards for interoperability that improve care delivery, optimize workflow, reduce ambiguity and enhance knowledge transfer among all of our stakeholders, including healthcare providers, government agencies, the vendor community, fellow SDOs and patients. In all of our processes we exhibit timeliness, scientific rigor and technical expertise without compromising transparency, accountability, practicality, or our willingness to put the needs of our stakeholders first.
HL7's Strategies:
1. Develop coherent, extendible standards that permit structured, encoded health care information of the type required to support patient care, to be exchanged between computer applications while preserving meaning.
2. Develop a formal methodology to support the creation of HL7 standards from the HL7 Reference Information Model (RIM).
3. Educate the healthcare industry, policy makers, and the general public concerning the benefits of healthcare information standardization generally and HL7 standards specifically.
4. Promote the use of HL7 standards world-wide through the creation of HL7 International Affiliate organizations, which participate in developing HL7 standards and which localize HL7 standards as required.
5. Stimulate, encourage and facilitate domain experts from healthcare industry stakeholder organizations to participate in HL7 to develop healthcare information standards in their area of expertise.
6. Collaborate with other standards development organizations and national and international sanctioning bodies (e.g. ANSI and ISO), in both the healthcare and information infrastructure domains to promote the use of supportive and compatible standards.
7. Collaborate 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.
What Does the Name HL7 Mean
"Level Seven" refers to the highest level of the International Organization for Standardization (ISO) communications model for Open Systems Interconnection (OSI) - the application level. The application level addresses definition of the data to be exchanged, the timing of the interchange, and the communication of certain errors to the application. The seventh level supports such functions as security checks, participant identification, availability checks, exchange mechanism negotiations and, most importantly, data exchange structuring.
Why HL7
There are several health care standards development efforts currently underway throughout the world. Why then, embrace HL7? HL7 is singular as it focuses on the interface requirements of the entire health care organization, while most other efforts focus on the requirements of a particular department. Moreover, on an ongoing basis, HL7 develops a set of protocols on the fastest possible track that is both responsive and responsible to its members. The group addresses the unique requirements of already installed hospital and departmental systems, some of which use mature technologies.
While HL7 focuses on addressing immediate needs, the group continues to dedicate its efforts to ensuring concurrence with other United States and International standards development activities. Argentina, Australia, Canada, China, Czech Republic, Finland, Germany, India, Japan, Korea, Lithuania, The Netherlands, New Zealand, Southern Africa, Switzerland, Taiwan, Turkey and the United Kingdom are part of HL7 initiatives. Moreover, HL7 is an American National Standards Institute (ANSI) approved Standards Developing Organization (SDO). HL7 strives to identify and support the diverse requirements of each of its membership constituencies: Users, Vendors, and Consultants. Cognizant of their needs, requirements, priorities and interests, HL7 supports all groups as they make important contributions to the quality of the organization. The committee structure, balanced balloting procedures and open membership policies ensure that all requirements are addressed uniformly and equitably with quality and consistency.
How is HL7 Organized
The organization is managed by a Board of Directors, which is comprised of eight elected positions and three appointed positions. The organization is comprised of
Technical Committees and Special Interest Groups that are responsible for defining the HL7 standard protocol. Each Technical Committee and Special Interest group is chaired by two or more co-chairs. Collectively, the co-chairs comprise the Technical Steering Committee, which votes on issues related to the standard. Votes of the Technical Steering Committee are passed as recommendations to the Board of Directors, who make the final decision. HL7 members are encouraged to participate in all of these committees.
New and Ongoing Initiatives
HIPAA
Health Level Seven's initial involvement in the HIPAA legislation began in 1996 with the formation of the Claims Attachments special interest group (since re-named simply the Attachment special interest group.) The Attachment Special Interest Group was formed to standardize the supplemental information needed to support health care insurance, and other e-commerce transactions. The initial deliverable of this group was 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. An important effort as guided by the Board of HL7 the, Attachment special interest group is tasked with assisting in the implementation of the Administrative Simplification provisions of HIPAA mandates, providing on-going support, and to represent HL7 in the HIPAA 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 ASC X12N transactions.
Final copies of all HIPAA-mandated standards can be obtained from the Washington Publishing web site.
The Reference Information Model (RIM)
The Reference Information Model (RIM) is the cornerstone of the HL7 Version 3 development process. An object model created as part of the Version 3 methodology, the RIM is a large pictorial representation of the clinical data (domains) and identifies the life cycle of events that a message or groups of related messages will carry. It is a shared model between all the domains and as such is the model from which all domains create their messages. Explicitly representing the connections that exist between the information carried in the fields of HL7 messages, the RIM is essential to our ongoing mission of increasing precision and reducing implementation costs.
Templates
An HL7 template is a data structure, based on the HL7 Reference Information Model, and which expresses the data content needed in a specific clinical or administrative context. They are prescribed patterns by which multiple OBX segments may be combined to describe selected, gross observations. Some observations may be quite simple, such as the blood pressure concept in healthcare, which involves a set of expected observations (i.e., systolic, diastolic, patient position, method, etc.) Other
more elaborate diagnostic procedures may involve hundreds of related pieces of information, including anatomy, orientation, sequences of measurements, etc. Templates provide a means of coupling the multiple OBX segments needed to send the observation with separately encapsulated rules for combining/validating them for the particular observation. Based on user need and preference, the template offers the user the advantage of defining the collection of OBX segments needed and the corresponding set of validation rules once, and once, defined, the structure can be used again and again. Since they are based on a specific user's needs/requirements, Templates can be "plug and play" at a given user site.
HL7 approved the formation of the Templates Special Interest Group at its September 2000 meeting. The group will create normative standards for the definition of HL7 templates. These standards will provide that an HL7 template be composed of data structures drawn from the HL7 RIM, that make use of HL7 vocabulary domains. The group will also define the procedures for administering a meta-data repository to serve as the home for templates defined by HL7 bodies, HL7 members, and other parties, and will develop procedures and educational material to guide interested parties in the development of HL7 templates.
Vocabulary
HL7 learned long ago that while data can be exchanged between systems, its usefulness is compromised unless there is a shared, well defined, and unambiguous knowledge of the meaning of the data transferred. Since much of the data being transferred is coded, either by HL7 or other organizations, HL7 began a focused effort via the formation of the Vocabulary Technical Committee to organize and maintain vocabulary terms used in its messages.
This group is working to provide an organization and repository for maintaining a coded vocabulary that, when used in conjunction with HL7 and related standards, will enable the exchange of clinical data and information so that sending and receiving systems have a shared, well defined, and unambiguous knowledge of the meaning of the data transferred. The purpose of the exchange of clinical data includes, but is not limited to: provision of clinical care, support of clinical and administrative research, execution of automated transaction oriented decision logic (medical logic modules), support of outcomes research, support of clinical trials, and to support data reporting to government and other authorized third parties. To achieve this goal, the Vocabulary Technical Committee will work cooperatively with all other groups that have an interest in coded vocabularies used in clinical computing. Some of the groups that we will seek to work closely with include: standards development organizations, creators and maintainers of vocabularies, government agencies and regulatory bodies, clinical professional specialty groups, vocabulary content providers, and vocabulary tool vendors.
XML
Health Level Seven has been actively working with XML technology since the formation of the SGML/XML Special Interest Group in September of 1996. Since that time, the SGML/XML group has evolved into two separate groups:
the XML Special Interest Group - which supports the HL7 mission through recommendations on use of Extensible Markup Language (XML) standards for all of HL7's platform- and vendor-independent healthcare specifications.
the Structured Documents Technical Committee - which support the HL7 mission through development of structured document standards for healthcare.
Both of these groups have produced work items that have been ratified by the HL7 membership. In 1999, HL7 endorsed a recommendation for using XML as an alternative syntax for HL7 V2.3.1 messages. This recommendation was informative in nature (not required for compliance) and was thus not submitted to ANSI for approval. However, an XML encoding for Version 2.4 was balloted and submitted for approval to ANSI in early 2001.
In September 2000, the HL7 membership ratified Version 1 of the Clinical Document Architecture, which defines an XML architecture for exchange of clinical documents. The encoding is based on XML DTDs included in the specification and its semantics are defined using the HL7 RIM (Reference Information Model) and HL7 registered coded vocabularies. In January 2005, the HL7 Membership ratified Release 2 of CDA.
The initial release of Version 3 will use only XML encoding.
HL7 actively participates in and supports the W3C, the organization responsible for the development of XML.
Specifications
The Messaging Standard
Version 3.0
Version represents a significant departure from "business as usual" for HL7. Offering lots of optionality and thus flexibility, the V2.x series of messages were widely implemented and very successful. These messages evolved over several years using a "bottom-up" approach that has addressed individual needs through an evolving ad-hoc methodology. There is neither a consistent view of that data that HL7 moves nor that data's relationship to other data. HL7's success is also largely attributable to its flexibility. It contains many optional data elements and data segments, making it adaptable to almost any site. While providing great flexibility, its optionality also makes it impossible to have reliable conformance tests of any vendor's implementation and also forces implementers to spend more time analyzing and planning their interfaces to ensure that both parties are using the same optional features. Version 3 addresses these and other issues by using a well-defined methodology based on a reference information (i.e., data) model. It will be the most definitive standard to date. Using rigorous analytic and message building techniques and incorporating more trigger events and message formats with very little optionality, HL7's primary goal for Version 3 is to offer a standard that is definite and testable, and provide the ability to certify vendors' conformance. Version 3 uses an object-oriented development methodology and a Reference Information Model (RIM) to create messages. The RIM is an essential part of the HL7 Version 3 development methodology, as it provides an explicit representation of the semantic and lexical connections that exist between the information carried in the fields of HL7 messages.
The HL7 Version 2 Messaging Standard — Application Protocol for Electronic Data Exchange in Healthcare Environments — is considered to be the workhorse of data exchange in healthcare and is the most widely implemented standard for healthcare information in the world.
HL7 Version 2.5 introduces a number of new events, segments and messages, as well as a significantly expanded chapter on Control. Version 2.5 is more consistent and supports more functionality than any of the previous versions. Modifications from Version 2.4 include:
Improved documentation of the data types The definition of a message profile methodology Better support for imaging (IHE) by means of a new segment and a new order
message Support for orders related to blood products A new message that supports diagnoses/procedure messages in 'update'
mode
Version 2.4
APPROVED AS AN ANSI STANDARD OCTOBER 6, 2000.View Errata View Addendum
HL7 v.24 introduces Conformance Query profiles in chapters 5, and adds messages for laboratory automation, application management and personnel management. Additionally, a new event, specific to OPPS and APC requirements was added. This event, Transmit Ambulatory Payment, includes two new segments, the Grouping/Reimbursement Visit Segment and the Grouping Reimbursement Procedure Segment.
The structure of the Version 2.4 publication is highlighted below.
Click here for a brief introduction to HL7 messaging.
Chapter Name Content
1 - Introduction Overview of HL7.
2 - Control Message Definitions, Interchange Protocols.
3 - Patient Administration Admit, Discharge, Transfer, and Demographics.
4 - Order Entry Orders for Clinical Services and Observations, Pharmacy, Dietary, and Supplies.
5 - Query Rules applying to queries and to their responses.
6 - Financial Management Patient Accounting and Charges.
Application control-level requests, transmission of application management information.
15 - Personnel Management
Professional affiliations, educational details, language detail, practitioner organization unit, practitioner detail, staff identification.
Appendix A- Data Definition Tables
All HL7 and User-defined tables and their values.
Appendix B- Lower Layer Protocols
Protocols for lower layer of OSI model.
Appendix C-BNF Message Descriptions
BNF representations of abstract message definitions at the segment level.
Appendix D-Glossary Glossary of terms.
Version 2.3.1
APPROVED AS AN ANSI STANDARD April 14, 1999. View Errata View Addendum
HL7 V.2.3.1 includes an updated TQ (timing/quantity) datatype to manage order occurrences, updates to the OBR segments and ORU message to facilitate public health surveillance reporting, updates to tables, segments and data types to accommodate international paradigms for reporting names and pharmacy orders, and the addition of a new field to the ORC segment to satisfy the HCFA Medical Necessity requirements for outpatient services, and an update to the FT segment to satisfy federal requirements for Level 2 Modifiers.
The structure of the Version 2.3.1 publication is highlighted below.
Click here for a brief introduction to HL7 messaging.
Chapter Name Content
1 - Introduction Overview of HL7.
2 - Control Message Definitions, Interchange Protocols.
3 - Patient Administration Admit, Discharge, Transfer, and Demographics.
4 - Order Entry Orders for Clinical Services and Observations, Pharmacy, Dietary, and Supplies.
5 - Query Rules applying to queries and to their responses.
8 - Master Files Health Care Application Master Files.
9 - Medical Records/Information Management
Document Management Services and Resources.
10 - Scheduling Appointment Scheduling and Resources.
11 - Patient Referral Primary Care Referral Messages.
12 - Patient Care Problem-Oriented Records.
Appendix A- Data Definition Tables
All HL7 and User-defined tables and their values.
Appendix B- Lower Layer Protocols
Protocols for lower layer of OSI model.
Appendix C - Network Management
Application control-level requests, transmission of application management information.
Appendix C-BNF Message Descriptions
BNF representations of abstract message definitions at the segment level.
Appendix D-Glossary Glossary of terms.
Version 2.3
APPROVED AS AN ANSI STANDARD May 13, 1997
HL7 V.2.3 includes an updated TQ (timing/quantity) datatype to manage order occurrences, updates to the OBR segments and ORU message to facilitate public health surveillance reporting, updates to tables, segments and data types to accommodate international paradigms for reporting names and pharmacy orders, and the addition of a new field to the ORC segment to satisfy the HCFA Medical Necessity requirements for outpatient services, and an update to the FT segment to satisfy federal requirements for Level 2 Modifiers.
The structure of the Version 2.3 publication is highlighted below.
HL7 V.2.3 introduces document management messages, messages for appointment servicing and resource scheduling, messages for patient referrals and messages to track patient goals.
The structure of the Version 2.3 publication is highlighted below.
Click here for a brief introduction to HL7 messaging.
Chapter Name Content
1 - Introduction Overview of HL7.
2 - Control Message Definitions, Interchange Protocols.
3 - Patient Administration Admit, Discharge, Transfer, and Demographics.
4 - Order Entry Orders for Clinical Services and Observations, Pharmacy, Dietary, and Supplies.
5 - Query Rules applying to queries and to their responses.
6 - Financial Management Patient Accounting and Charges.
8 - Master Files Health Care Application Master Files.
9 - Medical Records/Information Management
Document Management Services and Resources.
10 - Scheduling Appointment Scheduling and Resources.
11 - Patient Referral Primary Care Referral Messages.
12 - Patient Care Problem-Oriented Records.
Appendix A- Data Definition Tables
All HL7 and User-defined tables and their values.
Appendix B- Lower Layer Protocols
Protocols for lower layer of OSI model.
Appendix C - Network Management
Application control-level requests, transmission of application management information.
Appendix C-BNF Message Descriptions
BNF representations of abstract message definitions at the segment level.
Appendix D-Glossary Glossary of terms.
The Clinical Document Architecture
APPROVED AS AN ANSI STANDARD November 2000.
The CDA, which was until recently known as the Patient Record Architecture (PRA), provides an exchange model for clinical documents (such as discharge summaries and progress notes)—and brings the healthcare industry closer to the realization of an electronic medical record. The CDA Standard is expected to be published as an ANSI approved standard by the end of the year.
By leveraging the use of XML, the HL7 Reference Information Model (RIM) and coded vocabularies, the CDA makes documents both machine-readable—so they are easily parsed and processed electronically—and human-readable—so they can be easily retrieved and used by the people who need them. CDA documents can be displayed using XML-aware Web browsers or wireless applications such as cell phones.
The Clinical Context Management Specification (CCOW)
Version 1.3
Version 1.3 introduces the following enhancements:
Definition for an annotation agent (a component that is allowed to add data to the clinical context)
Definition for a user's digital certificate subject (which is the first annotation subject)
Definition of the observation subject (which identifies a real-world clinical observation)
The structure of the Version 1.3 publication is highlighted below:
Chapter Name Content
Context Management ("CCOW") Specification Technology- and Subject-Independent Component Architecture
Specifies the Health Level Seven Context Management Architecture (CMA). This architecture enables multiple applications to be automatically coordinated and synchronized in clinically meaningful ways at the point-of-use. The architecture specified in this document establishes the basis for bringing interoperability among healthcare applications to the point-of-use, such as the clinical desktop
Context Management ("CCOW") Specification Subject Data Definitions
Provides a specification of the standard context data items that are supported for all subjects in the HL7 Context Management Architecture (CMA) as well as custom subjects and items that are not defined explicitly in this version of the CMA.
Context Management ("CCOW") Specification User Interface: Microsoft Windows and Web Browser
Specifies the user interface requirements and guidelines for Microsoft Windows™ -based and web browser-based applications that are compliant with the HL7 Context Management Specification, Technology- And Subject- Independent Component Architecture.
Specifies the details needed to develop Microsoft ActiveX implementations of applications and components that conform to the HL7 Context Management Architecture (CMA).
Health Level-Seven Standard Context Management ("CCOW") Specification Component Technology Mapping: Web
Specifies the details needed to develop web implementations of applications and components that conform to the HL7 Context Management Specification, Technology- And Subject- Independent Component Architecture.
Version 1.2
APPROVED AS AN ANSI STANDARD September 21, 2000
Version 1.2 introduced the following enhancements:
Definition for an annotation agent (a component that is allowed to add data to the clinical context)
Definition for a user's digital certificate subject (which is the first annotation subject)
Definition of the observation subject (which identifies a real-world clinical observation)
The structure of the Version 1.2 publication is highlighted below:
Chapter Name Content
Context Management ("CCOW") Specification Technology- and Subject-
Specifies the Health Level Seven Context Management Architecture (CMA). This architecture enables multiple applications to be automatically coordinated and
Independent Component Architecture
synchronized in clinically meaningful ways at the point-of-use. The architecture specified in this document establishes the basis for bringing interoperability among healthcare applications to the point-of-use, such as the clinical desktop.
Context Management ("CCOW") Specification Subject Data Definitions
Provides a specification of the standard context data items that are supported for all subjects in the HL7 Context Management Architecture (CMA) as well as custom subjects and items that are not defined explicitly in this version of the CMA.
Health Level-Seven Standard Context Management ("CCOW") Specification User Interface: Microsoft Windows and Web Browser version
Specifies the user interface requirements and guidelines for Microsoft Windows™ -based and web browser-based applications that are compliant with the HL7 Context Management Specification, Technology- And Subject- Independent Component Architecture.
Health Level Seven Standard Context Management ("CCOW") Specification Component Technology Mapping: ActiveX
Specifies the details needed to develop Microsoft ActiveX implementations of applications and components that conform to the HL7 Context Management Architecture (CMA). Using this specification, the resulting applications and service components will be able to communicate with each other per the CMA even if they were independently developed.
Health Level-Seven Standard Context Management ("CCOW") Specification Component Technology Mapping: Web
Specifies the details needed to develop web implementations of applications and components that conform to the HL7 Context Management Specification, Technology- And Subject- Independent Component Architecture.
Version 1.1
APPROVED AS AN ANSI STANDARD March 15, 2000
Version 1.1 introduced the following enhancements:
Definition an Encounter subject Support for defining custom subjects Addition of BNF notation for describing syntax of the various strings used
throughout the specification Details for supporting ActiveX implementations using DCOM and Windows
Terminal Server.
The structure of the Version 1.1 publication is highlighted below:
Chapter Name Content
Context Management ("CCOW") Specification Technology- and Subject-Independent Component Architecture
Specifies the Health Level Seven Context Management Architecture (CMA). This architecture enables multiple applications to be automatically coordinated and synchronized in clinically meaningful ways at the point-of-use. The architecture specified in this document
establishes the basis for bringing interoperability among healthcare applications to the point-of-use, such as the clinical desktop.
Context Management ("CCOW") Specification Subject Data Definitions
Provides a specification of the standard context data items that are supported for all subjects in the HL7 Context Management Architecture (CMA) as well as custom subjects and items that are not defined explicitly in this version of the CMA.
Health Level-Seven Standard Context Management ("CCOW") Specification User Interface: Microsoft Windows
Specifies the user interface requirements and guidelines for Microsoft Windows -based applications that are compliant with the HL7 Context Management Specification, Technology- And Subject- Independent Component Architecture.
Health Level Seven Standard Context Management ("CCOW") Specification Component Technology Mapping: ActiveX
Specifies the details needed to develop Microsoft ActiveX implementations of applications and components that conform to the HL7 Context Management Architecture (CMA). Using this specification, the resulting applications and service components will be able to communicate with each other per the CMA even if they were independently developed.
Version 1.0
APPROVED AS AN ANSI STANDARD July 26, 1999
This was the first version of the Clinical Context Management Specification that was ballot by HL7.
The structure of the Version 1.0 publication is highlighted below:
Chapter Name Content
Context Management ("CCOW") Specification Technology- and Subject-Independent Component Architecture
Specifies the Health Level Seven Context Management Architecture (CMA). This architecture enables multiple applications to be automatically coordinated and synchronized in clinically meaningful ways at the point-of-use. The architecture specified in this document establishes the basis for bringing interoperability among healthcare applications to the point-of-use, such as the clinical desktop.
Context Management ("CCOW") Specification Subject Data Definitions: Patient Subject
Specifies the standard context data items that are available for applications to use in setting and accessing the common clinical context.
Context Management ("CCOW") Specification, Data Definition: User Subject
Specifies the standard context data items that are available for applications to use in setting and accessing the common clinical context.
Health Level Seven Standard Context Management ("CCOW")
Specifies the details needed to develop Microsoft ActiveX implementations of applications and components that conform to the HL7 Context Management Architecture
(CMA). Using this specification, the resulting applications and service components will be able to communicate with each other per the CMA even if they were independently developed.
Context Management Specification, User Interface: Microsoft Window, OS.
Specifies the user interface when using the common clinical context component as specified by the Clinical Context Object Workgroup (CCOW).
The Arden Syntax for Medical Logic Systems
APPROVED AS AN ANSI STANDARD July 26, 1999
The Arden Syntax for Medical Logic Systems Version 2.0 was the initial version of the standard balloted by HL7. Version 1.0 was balloted and is maintained by the ASTM.
Developed by HL7's Arden Syntax and Clinical Decision Support technical committee, this standard is a language for representing and sharing medical knowledge among personnel, information systems and institutions. It is designed for organizations that require or develop systems that automatically assist physicians in decisions and alerts. The logic for making these decisions or issuing these alerts is encoded into health knowledge bases called MLM, each of which contains sufficient knowledge to make a single decision. Contradiction alerts, management suggestions, data interpretations, treatment, protocols, and diagnosis scores are examples of the health knowledge bases than can represented using the Arden Syntax.
HL7 Intellectual Property
Health Level Seven, Inc., asserts and retains copyright in all works contributed by members and non-members relating to all versions of the Health Level Seven standards and related materials unless other arrangements are specifically agreed upon in writing.
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