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While most HL7 v2 messaging is of the store-and-forward kind, where a sender sends a message to a partner, receives a positive acknowledgement and forgets the transaction, there are circumstances where a sender wants to query the receiver and get and process a response. For ADT-related queries A19 transaction serves this function. A client application can send an A19 QRY message, with a patient identifier and assigning authority and request patient demographic information to be returned using the A19 ADR response message.
In this article we will develop and exercise an A19 Query Processor solution.
This article assumes that the reader has the SOA Suite for healthcare integration environment with all necessary components installed and ready to use. The Bill of Materials for such an environment and a discussion on where the components can be obtained is provided in the earlier article, “SOA Suite for healthcare integration Series – Overview of the Development Environment”, to be found at https://blogs.czapski.id.au/2012/08/soa-suite-for-healthcare-integration-series-overview-of-the-development-environment.

The complete article is available at https://blogs.czapski.id.au/wp-content/uploads/2013/01/SOASuiteHCI_ch12_A19Query_v0.1.0.pdf.

Data files used in this article series are available at:

ADT_A01_broken_1.hl7 – https://blogs.czapski.id.au/wp-content/uploads/2013/01/ADT_A01_broken_1.zip – this file contains a single ADT A01 transaction, in which the EVN segment’s name is rbroken, making the message invalid. This message is used in the article “SOA Suite for healthcare integration Series – Exception Handling – Processing Endpoint Errors” for testing exception handling
ADT_A01_output_1.hl7 – https://blogs.czapski.id.au/wp-content/uploads/2013/01/ADT_A01_output_1.zip – this file contains a single ADT A01 transaction
ADT_A03_output_1.hl7 – https://blogs.czapski.id.au/wp-content/uploads/2013/01/ADT_A03_output_1.zip – this file contains a single ADT A03 transaction
ADT_A01_output_5099.hl7 – https://blogs.czapski.id.au/wp-content/uploads/2013/01/ADT_A01_output_5099.zip – this file 5099 ADT A01 transactions, separated by \r\r\n, or Carriage Return, Carriage Return and New Line
QRY_A19.hl7 – https://blogs.czapski.id.au/wp-content/uploads/2013/01/QRY_A19.zip – this file contains a sample A19 query message