What Is HL7?

December 5th, 2006 by Scott McManis

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Posted in What is HL7?, HL7 Standard

The Health Language Seven (HL7) organization is an ANSI accredited Standards Developing Organization. Volunteers from around the world gather in quarterly meetings to produce and refine documentation that describes how clinical information will be shared between disparate healthcare applications in a provider setting.

What is HL7? Practically speaking, HL7 is the standard to which healthcare application vendors adhere when developing application interfaces to exchange patient data. The HL7 standard defines a method of moving clinical data between independent medical applications in near real time.

One would expect that by adopting the HL7 standard interfacing applications would be a ‘plug and play’ exercise. In reality, the commercial vendors of healthcare applications bend and customize HL7 to meet the needs of the customer and their systems. This is necessary to accurately exchange patient data.

Chapter 1 of the HL7 standard Version 2.3 states that “HL7 provides a common framework for implementing interfaces between disparate vendors”. The standard is intentionally flexible; designed to allow customization but inhibits ‘plug and play’ implementations.

In summary, HL7 Version 2 messaging is the acknowledged healthcare industry standard, and the best protocol available to date for exchanging clinical data among disparate cooperating systems in a healthcare setting.

Visit our HL7 Overview page for additional information.

Last 5 posts by Scott McManis
10 Responses to “What Is HL7?”
  1. What Are the Components of an HL7 Message? says:

    […] Each HL7 message is composed of groups and segments where: […]

  2. HL7 Acknowledgement (ACK) Messages - Guaranteed Message Delivery says:

    […] The HL7 2.5 standard defines close to 500 different message types. While some are only used occasionally, almost all HL7 interfaces will incorporate the H7 acknowledgment (ACK) message. An HL7 ACK message is used to insure that HL7 messages are delivered from system to system without being lost. […]

  3. HL7 Connection: HL7 for the rest of us…: » HL7 Acknowledgement (ACK) Messages - Guaranteed Message Delivery says:

    […] The HL7 2.5 standard defines close to 500 different message types. While some are only used occasionally, almost all HL7 interfaces will incorporate the H7 acknowledgment (ACK) message. An HL7 ACK message is used to insure that HL7 messages are delivered from system to system without being lost. […]

  4. Why map HL7 messages? says:

    […] Applications implementing different versions of the HL7 standard: During the past 20 years the HL7 community has released several versions of the HL7 2.x messaging standard. The first version of HL7 was HL7 2.1 and, when released in 1987, consisted of approximately 38 “useful” messages (not counting ACKs) and 27 segments. […]

  5. The chapters of the HL7 standard says:

    […] The HL7 2.X message standard has multiple chapters that provide the general rules by which HL7 compliant applications should communicate. The chapter layout came about in the beginning of HL7 based on the committees structure used to create the standard. […]

  6. What Is an OBX? says:

    […] In HL7 v2.x, the OBX is a segment used to transmit a single observation or observation fragment. It represents the smallest indivisible unit of a report. The principal mission of an OBX is to carry information about observations and results in report messages (i.e., ORU or MDM).  […]

  7. What is CDISC? says:

    […] CDISC is related-yet-separate from HL7 proper. While CDISC has mapped their data model (ODM) onto HL7’s reference information model (RIM), CDISC also stays neutral and makes mention of (or even provides mapp mappings to) other standards such as ISO, CEN, and other approaches from international organizations. […]

  8. HL7 Z-Segment: Questions and Answers says:

    […] Question 1: Can I insert a Z-segment anywhere in the HL7 message or can I only place the Z-segment at the […]

  9. The Chapters of the HL7 Standard says:

    […] HL7 2.X message standard has multiple chapters that provide the general rules by which HL7 compliant applications should […]

  10. What is an HL7 ADT Feed? says:

    […] With the constant updating of a client, customer or patient’s data, ADTs comprise the most HL7 messaging traffic. Change of address, addition of a middle name, and addition of next of kin are […]

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