This section describes the most common HL7 transport method used to send HL7 messages, called the Lower Layer Protocol (LLP). A less common HL7 transport called the Hybrid Lower Layer Protocol (HLLP) is also briefly discussed. Although HL7 messages are sent via a variety of TCP/IP transports, including FTP, SOAP and SMTP, LLP is the most common method.
n an HL7 message, each segment of the message contains one specific category of health information, such as patient information or patient visit data. The name of each segment in the message is specified by the first field of the segment, which is always three characters long.
Some message types support segment groups. An HL7 segment group is a collection of segments that always appear together. Depending on the scenario, some segment groups can be optional or repeating.
In this article, we will explore a typical sample HL7 message, and describe HL7 segments groups in detail.
HL7 is a messaging standard for data transfer and consistency across disparate systems, which plays a major role in healthcare interoperability. An HL7 message consists of one or more segments, which contains one specific category of information, such as patient information or patient visit data. Further, segments consists of one or more composites, also known as fields.
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