HL7 ADT Messages
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HL7 ADT messages (Admission, Discharge and Transfer) are a group of messages as defined in the HL7 version 2.x messaging standard. The focus of ADT messages is to convey data related to patient demographics and/or to healthcare encounters (visits). ADT messages are implemented by almost all software applications in a hospital setting.
1. IntroductionThe HL7 version 2 standard has the aim to support hospital internal workflows. Each of the chapters of the HL7 standard covers a different subset of the overall workflow: chapter 3 (ADT) supports workflows that require the exchange of patient demographics and/or encounter information.
Chapter 3 (ADT) defines a number of message structures and trigger events.
2. Trigger EventsA trigger event is the underlying reason for transmitting a message, e.g. “Patient has been admitted to the hospital”, “Patient address has changed”, or “Patient has moved from room 23 to room 29”. As soon as a trigger happens, a message is sent to all systems that have an interest in that particular type of information, enabling the receiving application to synchronize it’s database with the data as known by the sender of the message.
Examples of ADT trigger events (coded A01 up to A62) include:
3. Message Structure
The message structure may vary depending on the trigger event. A trigger event related to the “transfer of a patient” has a different structure than a “change of a person’s address”, or a “merge two patient records”. The following segments (in HL7 version 2 all messages are comprised of multiple segments) are of core importance in this chapter:
4. SummaryHL7 ADT messages (Admission, Discharge and Transfer) are implemented by almost all applications used within a hospital setting. The ADT trigger events typically occur in the administrative system of the hospital (Hospital Information System - HIS or Patient Administrative System - PAS). The resulting messages are sent to all ancillary systems enabling them to synchronize their application database with the latest information as available in the main administrative system.
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