Versions of the HL7 Standard

The HL7 Standard was created and is maintained by Health Level Seven, an American National Standards Institute (ANSI) accredited Standards Developing Organization (SDO) that operates in the healthcare arena. The HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More Standard is broadly divided into two categories – Version 2 (V2) and Version 3 (V3). The majority of HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More messaging employs messages that use the 2.3 or 2.3.1 versions of the standard. Newer versions of the standard, including V3, represent only a small portion of real-world usage in interfacing. HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More is also working on an emerging standard called HL7 FHIRFHIR stands for Fast Healthcare Interoperable Resource. This emerging standard combines the best fea... More.

With the passage of ARRAAmerican Recovery and Reinvestment Act of 2009 (ARRA) is an economic stimulus package enacted by the... More / HITECHAs a part of the America Recovery and Reinvestment Act (ARRA) of 2009, Health Information Technology... More, HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More version 2.5.1 is specifically selected as the healthcare standard to meet certain certification requirements. Consolidated CDAClinical Document Architecture (CDA) HL7 CDA uses XML for encoding of the documents and breaks down ... More, part of the V3 standard, was specified as well.

HL7 V2

The HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V2 standard was created mostly by clinical interface specialists, and was designed to provide a framework in which data could be exchanged between disparate clinical systems.

The V2 standard provides 80 percent of the interface framework, plus the ability to negotiate the remaining 20 percent of needs on an interface-by-interface basis. The standard achieves this goal by:

  • Defining HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More encoding rules, groupings, cardinality, and the default character set (i.e. ASCII).
  • Providing support for local variations in data interchanges by allowing optional fields, additional messages, or additional portions of messages.
  • Evolving and adapting to changes required in local implementations, or to issues discovered via real-world usage of the standard.
  • Supporting batch processing of message file transfers.
  • Considering the relationship between the HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More standard protocol with other protocols, such as lower layer protocols (i.e. avoiding replication of features), applications protocols (notably DICOMDigital Imaging and Communications in Medicine (DICOM) is a common format for image storage. It allo... More and X12X12 provides for electronic exchange of business transactions-electronic data interchange (EDI). The... More, and protocols published by ASTM and IEEEInstitute of Electrical and Electronics Engineers (IEEE) is accredited by ANSI to submit its documen... More), and other proprietary healthcare protocols.

Generally, all 2.X versions are backwards-compatible with earlier versions because the V2 standard allows applications to ignore message elements they do not expect. This means that an older application can receive and process messages from newer applications using newer HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More versions – i.e., messages containing more segments and/or fields – without producing an error.

HL7 V3

The HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V3 standard was first released in late 2005, and was strongly influenced by the government and medical information users rather than clinical interface specialists. The V3 version is not backwards compatible with V2 versions of the standard, so existing V2 interfaces will not (without considerable modification) be able to communicate with interfaces using V3.

HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V3 was created to address some specific challenges identified in the HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V2 standard, including:

  • An implied, rather than consistent, data model.
  • An absence of formal methodologies with data modeling, creating inconsistencies and difficulties in understanding.
  • A lack of well-defined roles for applications and messages used in different clinical functions.
  • Too much flexibility and not enough of a full solution.

The goals of HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V3 were to increase worldwide adoption of the standard, define a consistent data model, create a more precise and less vague standard, and create an entirely new standard that would not be hindered by legacy issues. The decision to make HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V3 a new standard (and incompatible with older and more widely implemented V2 versions) means that it is has not been widely adopted thus far.

To adopt HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V3, users would need to create and maintain HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V2-based interfaces with HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V2-based applications, while deploying new V3-based applications and implementing interfaces between them. For this reason, HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V3 has been adopted primarily for use in applications without legacy communication requirements, without historical use of HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V2 in communications, or in regions/locations that have high government enforcement of HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More V3 usage.

FHIR

Fast Health Interoperable Resources (FHIR) is a next generation standards framework that combines the best features of HL7 V2, HL7 V3, and HL7 Clinical Document Architecture (CDAClinical Document Architecture (CDA) HL7 CDA uses XML for encoding of the documents and breaks down ... More), while leveraging the latest web service technologies. The design of FHIRAn HL7 standard that is short for Fast Healthcare Interoperability Resources and pronounced “Fire... More is based on RESTful web servicesWeb services are a standardized way of integrating applications. Using open standards, businesses ca... More, and is based on modular components called ‘resources’. FHIRAn HL7 standard that is short for Fast Healthcare Interoperability Resources and pronounced “Fire... More supports both XML and JSON. The first normative edition is expected in 2017.

HL7HL7 is a Standards Developing Organization accredited by the American National Standards Institute (... More Timeline

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Additional information can be found on the HL7 Standards resource site or visit the Blog page  of the Corepoint Health website for articles and insights.

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