Getting data from a HL7 ORU_R01 message | Division by Zero

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Getting data from a HL7 ORU_R01 message

Getting data from a HL7 ORU_R01 message

Written by Division by Zero

Tuesday, 16 August 2011 08:49

A while ago someone asked me how to retrieve data from an OBX segement in an ORU_R01 message. This isn't quite obvious to do. So here's an example on how to get a Base64 encoded PDF file from an ORU_R01 message.

In the following example I use some code from an earlier post.

The first bit shows how to add a PDF file (this could be any file) to the message. The last few lines of code is how to retreive the PDF file from the message. The file is in the data property of the ED data type.

// I use an example message as template. This is a shortcut, so I don't have to create this message from scratch
string templateMessage = "MSH|^~\\&|Application Name|Hospital Name||44|20000623134511||ORU^R01|20000623134511135475|P|2.3\rPID||12345678|69619||John^Smith||19550101|M\rORC|RE||||A\rOBR|||144137|Report Name|||201002221034|||||||||||||||201006281344|||F||||||Some Study|472^LastName^FirstName\rOBX|1|ED|REPORT_NAME||";
PipeParser pipeParser = new PipeParser();
NHapi.Model.V23.Message.ORU_R01 msg = (NHapi.Model.V23.Message.ORU_R01) pipeParser.Parse(templateMessage);
 
Terser terser = new Terser(msg);
// Now we retreive the first observation result (there's only one in the template)
NHapi.Model.V23.Segment.OBX obx = msg.GetRESPONSE().GetORDER_OBSERVATION().GetOBSERVATION().OBX;
// The last field needs to be filled with a Basse64 encoded PDF-file. First we need to set
// the right file type and encoding.
Terser.Set(obx, 5, 0, 1, 1, "Acrobat");
Terser.Set(obx, 5, 0, 2, 1, "text");
Terser.Set(obx, 5, 0, 3, 1, "pdf");
Terser.Set(obx, 5, 0, 4, 1, "Base64");
 
// Now we read the PDF, encode it and add it to the OBX segment
byte[] pdfContent = File.ReadAllBytes("..\\..\\..\\ORUExample\\Resources\\Example.pdf");
Terser.Set(obx, 5, 0, 5, 1, Convert.ToBase64String(pdfContent));
 
// Now to retreive the PDF we need to get to the obervations. This will contain an element of the type ED
// Assume there are no repetitions. Get the first item everytime
NHapi.Base.Model.Varies v = msg.GetRESPONSE().GetORDER_OBSERVATION(0).GetOBSERVATION(0).OBX.GetObservationValue(0);
NHapi.Model.V23.Datatype.ED ed = (NHapi.Model.V23.Datatype.ED)v.Data;
byte[] pdFileContent = Convert.FromBase64String(ed.Data2.Value);

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