HL7 (Health Language 7) is a "standard" utilized by the healthcare
industry to enable messaging between applications i.e. EHR to PMS
(practice management system) for example. It is managed and maintained
by Health Level Seven International (HL7)
which is a not-for-profit, ANSI-accredited standards developing
organization. The HL7 standard is often jokingly referred to as the
“non-standard standard.” This is not very fair but it does reflect the
fact that almost every hospital, clinic, imaging center, lab, and care
facility is “special” in terms of how it implements HL7 (really?, why?).
The reason is primarily because there is no such thing as a standard
business or clinical process for interacting with patients, clinical
data, or related personnel.
The HL7 messaging protocol was designed to facilitate high volumes of
pre-defined data to be shared across many applications reliably. The
protocol selected to make this happen was a traditional file transfer or
a TCP/IP socket in both a real-time and batched
fashion. HL7 v2.x message structure is complex, flat, and delimited. HL7
has obviously evolved over time. The current version of HL7 is v3.0.
However, older versions exist and make up the bulk of the standard used
today primarily because of the large number customization that have
been done to each HL7 message.
Reference:
https://catalyze.io/learn/hl7-101-a-primer ***
http://www.interfaceware.com/manual/xml.html
http://www.christian-sonek.de/hl7/hl7server_de
http://www.interfaceware.com/manual/full_tree.html **
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