HL7 MESSAGING STANDARD VERSION 2.3.1 IN PDF

The majority of HL7 messaging employs messages that use the 2. Newer versions of the standard, including V3, represent only a small portion of real-world usage in interfacing. The HL7 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.

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The editor also allows you to test libraries and verify that all data elements are available and data formats are correct before runtime. The editor executes a trace of parsing during the unmarshal process to assist with troubleshooting. HL7 is a standard for electronic data exchange in healthcare environments.

It standardizes the format and protocol for the exchange of certain key data sets among healthcare computer application systems. HL7 is designed to be flexible, allowing the various systems that send or receive patient information to share and apply data as needed. Because of this diversity in systems data models, operating systems, communication environments, and so on , HL7 cannot be a plug and play interface standard.

HL7, or Health Level Seven, is also the name of an organization consisting of technical committees and special interest groups whose goal is to provide standards for the exchange, management, and integration of data that support clinical patient care and the management, transfer, and assessment of healthcare services.

More specifically, the goal is to create flexible, cost effective approaches, standards, guidelines, methodologies, and related services for interoperability between healthcare information systems. The HL7 standard addresses the interfaces among various systems that send or receive healthcare focused information, such as patient admissions, registration, discharge or transfer ADT data, queries, resource and patient scheduling, orders, results, clinical observations, billing, master file update information, medical records, patient referral, and patient care.

It does not try to assume a particular architecture with respect to the placement of data within applications but is designed to support a central patient care system as well as a more distributed environment where data resides in departmental systems. Instead, HL7 serves as a way for dissimilar applications and data architectures operating in a heterogeneous system environment to communicate with each other. An HL7 transaction or message is comprised of a number of components in a defined sequence.

This section defines the components of the HL7 transaction. The HL7 message is a unit of data transferred between systems. It consist of a group of segments in a defined sequence. Each message has a message type that defines its purpose. A three-character code contained within each message identifies its type. A trigger event, a real-world event such as a patient being admitted, initiates the exchange of messages.

A segment is a logical grouping of data fields. Segments may occur only once or repeat in a message and may be required or optional. Each segment is given a name. Segments are identified by unique three-character codes known as the Segment IDs. A field is a string of characters. HL7 is not concerned with how a system actually stores data within an application. When fields are transmitted, they are sent as character strings.

Except where noted, HL7 data fields may take on the null value. Sending the null value, which is transmitted as two double quote marks "" , is different from omitting an optional data field. The difference appears when the contents of a message is used to update a record in a database rather than create a new one.

If no value is sent, that is, it is omitted the old value should remain unchanged. If the null value is sent, the old value should be changed to null. Position : The ordinal position or sequence of the data field within the segment. Maximum Length : Maximum number of characters that one occurrence of the data field may occupy. Type of Data : Restrictions on the contents of the data field. Optionality : Whether the field is required, optional, or conditional in a segment. Repetition : Whether the field may or may not repeat, or the number of times the field may repeat.

Table : The manner in which HL7 defines the valid values for tables varies depending on institution, data type, reference, and so forth. ID Number : Small integer that uniquely identifies the data field throughout the Standard. Message delimiters are the specific predefined characters that are used to define the beginning and end of a message component. They are the segment terminator, the field separator, the component separator, subcomponent separator, repetition separator, and escape character.

HL7 messages are grouped by type or purpose into transaction sets. For example, a Patient Administration ADT message is used to transmit patient admittance, transfer, demographic and discharge information. The Patient Administration transaction set includes messages that transmit portions, instances, or updates of this data necessary to the participating healthcare system.

Control defines the general rules that apply to all messages, including the form used to describe messages, encoding rules for converting abstract messages to string characters, programming procedures for exchanging messages, relationship with lower level protocols, common message segments, and the acknowledgment message that can be used as-is in multiple applications.

The Patient Administration transaction set HL7 Standard, chapter 3 , one of the most commonly used, provides demographic and visit information about patients. The event is transmitted as an unsolicited update or as a response to a record-oriented query. The Order Entry transaction set provides for the transmission of orders for materials or services, and information regarding orders, for specific patients or departments.

Order Entry messages include components that specify quantity, timing, billing, start and end date, priority, and so on. The Query transaction set provides requests for specific information with either an immediate or deferred response, depending on the type of query. Newer versions of HL7 include many of the most common queries that are likely to occur in a hospital.

The Observation Reporting message set provides for the transmission of structured patient-oriented clinical information. Message information is reported in text, numeric or categorical values. A master file is a common reference file containing more or less permanent descriptive information about a principal subject. In the healthcare environment, some common master files are doctor, location, system user, patient status, patient type, lab test definition, exam code definition, and charge master files.

The Master Files Notification messages support the distribution of changes to various master files between systems, by either providing changes to the files or making data available for review and possible inclusion. MDM messages may contain a description of the status of a document for example, the document has been dictated and is awaiting transcription or both the status description and the document itself.

A medical document or record is a legal document that serves as an accurate and comprehensive account of healthcare services provided to a patient. The Scheduling transaction set supports the communication of various events in relation to schedules, appointments, services and resources. A schedule controls the dates and times available for the performance of a service or the use of a resource. The scheduling set contains three basic types of messages:. The Unsolicited transaction, which passively gathers and provides scheduling information between systems.

Scheduling messages may also contain other supporting information, including the reason for the appointment, patient information, person initiating the appointment, and location. The Patient Referral transaction set provides for patient referral communications between separate healthcare related entities. This includes primary healthcare providers, hospitals, labs, specialists, government agencies, and other healthcare entities. The receiving entity may require billing information, test results, provider information, patient demographics and so forth, calling for multiple inquires and responses.

For this reason, the referral set includes the referral, requests for information, and returned patient information. The Patient Care transaction set supports the communication of problem-oriented records which include clinical problems, goals, and clinical pathway information.

The problem in this case may be a diagnosis or other professional description of healthcare issues affecting a specific patient. Goals are objectives to be attained as the result of healthcare intervention applied to an individual.

A pathway refers to a standardized plan of care by which progress toward an expected outcome is measured. The Laboratory Automation transaction set supports the communication of equipment information, including status, inventory, logs and service, test code settings, response, notification, and comment, as well as specimen status. The Application Management transaction set supports the transmission of application management information and application control-level requests.

The Personnel Management transaction set supports the transmission of details regarding education, language, practitioner, and professional affiliations, as well as information on practitioner organization unit, and staff identification. About HL7 HL7 is a standard for electronic data exchange in healthcare environments. The HL7 Standard The HL7 standard addresses the interfaces among various systems that send or receive healthcare focused information, such as patient admissions, registration, discharge or transfer ADT data, queries, resource and patient scheduling, orders, results, clinical observations, billing, master file update information, medical records, patient referral, and patient care.

Components of the HL7 Message An HL7 transaction or message is comprised of a number of components in a defined sequence. Segments A segment is a logical grouping of data fields. Fields A field is a string of characters. Data field characteristics are as follows: Position : The ordinal position or sequence of the data field within the segment.

Name : Descriptive name for the field. Message Delimiters Message delimiters are the specific predefined characters that are used to define the beginning and end of a message component. Escape Sequences in Text Fields Escape sequences vary depending on the type of field. Control Control defines the general rules that apply to all messages, including the form used to describe messages, encoding rules for converting abstract messages to string characters, programming procedures for exchanging messages, relationship with lower level protocols, common message segments, and the acknowledgment message that can be used as-is in multiple applications.

Patient Administration The Patient Administration transaction set HL7 Standard, chapter 3 , one of the most commonly used, provides demographic and visit information about patients.

Order Entry The Order Entry transaction set provides for the transmission of orders for materials or services, and information regarding orders, for specific patients or departments. Query The Query transaction set provides requests for specific information with either an immediate or deferred response, depending on the type of query.

Observation Reporting The Observation Reporting message set provides for the transmission of structured patient-oriented clinical information. Master File A master file is a common reference file containing more or less permanent descriptive information about a principal subject. Scheduling The Scheduling transaction set supports the communication of various events in relation to schedules, appointments, services and resources.

The scheduling set contains three basic types of messages: The Request transaction, used to request an appointment for services or the use of resources.

The Query transaction, which actively solicits scheduling information between systems. Patient Referral The Patient Referral transaction set provides for patient referral communications between separate healthcare related entities. Patient Care The Patient Care transaction set supports the communication of problem-oriented records which include clinical problems, goals, and clinical pathway information.

Laboratory Automation The Laboratory Automation transaction set supports the communication of equipment information, including status, inventory, logs and service, test code settings, response, notification, and comment, as well as specimen status. Application Management The Application Management transaction set supports the transmission of application management information and application control-level requests. Personnel Management The Personnel Management transaction set supports the transmission of details regarding education, language, practitioner, and professional affiliations, as well as information on practitioner organization unit, and staff identification.

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Health Level 7

Health Level Seven or HL7 refers to a set of international standards for transfer of clinical and administrative data between software applications used by various healthcare providers. These standards focus on the application layer, which is "layer 7" in the OSI model. The HL7 standards are produced by Health Level Seven International , an international standards organization , and are adopted by other standards issuing bodies such as American National Standards Institute and International Organization for Standardization. Hospitals and other healthcare provider organizations typically have many different computer systems used for everything from billing records to patient tracking. All of these systems should communicate with each other or "interface" when they receive new information, or when they wish to retrieve information, but not all do so. HL7 International specifies a number of flexible standards, guidelines, and methodologies by which various healthcare systems can communicate with each other. Such guidelines or data standards are a set of rules that allow information to be shared and processed in a uniform and consistent manner.

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