Cannot parse valid HL7 message

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Question

#HL7 #Ensemble #HealthShare #InterSystems IRIS for Health

I'm having problems with an HL7 message that is not properly parsed by IRIS (any version, including Ensemble).

The message is a OML_O21 and is valid, in fact is similar of what is described in the document "IHE Laboratory Technical Framework, Volume 2a (LAB TF-2a) version 6.0".
This is the sample from the IHE document (paragraph 2315):

MSH|^~\&|OF|Chemistry|AM|Automation|200309060825||OML^O21^OML_O21|msgOF101|T|2.5|123||||USA||EN
PID|1||12345^5^M10^Memphis_Hosp^PI||EVERYMAN^ADAM^^JR^^^L|19800101|M 2320
PV1|1|O|Ward|||||||||||||||12345
ORC|NW|||666^gastric|||||200309060824|222221^NURSE^NANCY|||||||||||Entero-gastric^^^^^^FI^^^EG02
TQ1|||||||||A
OBR||555_1^chemistry||GLUC^GLUCOSE^L||||||1234^BLEEDER|S|||||222222^PHYSICIAN^^^^DR|822325 1
SPM|1|123456781^gastric ||SER|||||||P||||||200309060735|200309060821||||||||1
ORC|NW|||666^gastric|||||200309060710|222221^NURSE^NANCY|||||||||||Entero-gastric^^^^^^FI^^^EG02
TQ1|||||||||A 2330
OBR||555_2^chemistry||GLUC^GLUCOSE^L||||||1234^BLEEDER|S||||| 222222^PHYSICIAN^^^^DR|821
SPM|1|123456782^gastric||SER|||||||P||||||200309060755|200309060821||||||||1

The result in IRIS is:

Is the IHE document sample an invalid message?
Because of this issue I cannot handle this message in rules and DTL

Discussion (6)4

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Jeffrey Drumm · May 26

Looking through the HL7 2.5 OML_O21 structure as supplied by InterSystems, you'll find that there's a nested PIDgrpgrp() under ORCgrp().OBRgrp() that has a subordinate ORCgrp(). It looks like the parse is attempting to match on the required OBR segment in the nested PIDgrpgrp().ORCgrp().

You have a couple of options ... both of which require a custom schema to match your message. ~~The first is to make the OBR segment in the PIDGrpgrp().ORCgrp() optional~~; the second is to remove the PIDgrpgrp() grouping entirely in the custom schema.

EDIT: The first option doesn't work since the ORC matches on the optional ORC segment in the nested PIDgrpgrp.ORCgrp(), which makes it attempt to match on the required PIDgrpgrp.ORCgrp().OBXgrp().

3 0

score 0 · Answer 1 · 2024-05-24T13:10:13-04:00

There is a Schema issue, it is not liking the way you're grouping several segments together which is resulting in the error.

score 0 · Answer 2 · 2024-05-25T07:43:44-04:00

Hello Scott, thank you very much for the response. What do you mean by schema issue? I'm not grouping anything; the message used was taken from the official IHE Laboratory Technical Framework. I'm having the issue with a message I receive that is similar (virtually identical) to the IHE document message.

score 1 · Answer 3 · 2024-06-12T11:50:48-04:00

Thank you, Jeffrey, I had eventually resolved it this way. However, I didn't like using this method; in fact, the system is declaring a document that is actually valid and standard as invalid. Creating a custom schema to handle a standard HL7 honestly doesn't appeal to me much. Anyway, thank you very much for the response; indeed, that's exactly what I did, and it's working! :)

score 1 · Answer 4 · 2024-05-27T07:32:27-04:00

The message is not valid as per HL7 v2.5 section 4.4.6.

The second ORC...TQ1...OBR is invalid, it should be ORC...OBR...TQ1 : in the ORDER_PRIOR group, ORC is optionnal and must be followed by OBR followed by optional NTE and then TQ1 group.

Keep in mind : IRIS HL7 schemas are based on formal grammars published by HL7.org.

score 0 · Answer 5 · 2024-06-16T07:41:49-04:00

So, this imply that the sample message published in the document "IHE Laboratory Technical Framework, Volume 2a (LAB TF-2a)" is actually an invalid message?