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HL7 V2 messaging is widely used in Australia, including the transmission of Pathology results from laboratories to providers. This section provides a broad overview of the format and function of pathology messages before detailing specific elements in detail. Electronic ordering is less well developed currently but is used in some arenas and provides significant potential advantages for the requester and filler of laboratory tests.

HL7 V2 was developed before the introduction of xml or json and the format is text based and unique to HL7 v2. It was originally designed to pass 7 bit channels and optimizes file size and in Australia is restricted to the ASCII character set as described in the appendix on parsing HL7 v2. Implementers should read and understand Appendix 1 Parsing HL7v2. The file format contains no field names and requires pre-existing knowledge of its structure to process. It is highly storage and bandwidth efficient however.

Most results between laboratories and providers are currently sent in unsolicited mode, where no electronic order was sent, but a paper request was used. An HL7v2 ORU^R01 message is used for this and an example appears below.

 

Example Pathology Message
MSH|^~\&|EQUATORDXTRAY^EQUATORDXTRAY:3.1.2^L|QML^2184^AUSNATA|||20160612150255+1000||ORU^R01|BGC06121502965-8968|P|2.3.1^AUS&&ISO^AS4700.2&&L|||AL||AUS
PID|||||ANTHONY^JENNIFER^KAY||19490709|F|||225 Wises Road^^BUDERIM^QLD^4551||^^^^^^54455055||||||4157269354
PV1|1|O||||||0488077Y^MCKENZIE^RAY^^^DR^^^AUSHICPR^L^^^UPIN|0191324T^MCINTYRE^ANDREW^^^DR^^^AUSHICPR^L^^^UPIN
ORC|RE||15-57243112-CBC-0^QML^2184^AUSNATA||CM|||||||0488077Y^MCKENZIE^RAY^^^DR^^^AUSHICPR^L^^^UPIN
OBR|1||15-57243112-CBC-0^QML^2184^AUSNATA|CBC^MASTER FULL BLOOD COUNT^2184|||20151221|||||||201512211940||0488077Y^MCKENZIE^RAY^^^DR^^^AUSHICPR^L^^^UPIN||From QML"QMLG4399292.oru" 17.03.2016||DR=UMA2P,LN=15-57243112,RC=Y||201603171124||HM|F||^^^201512210000|0488077Y^MCKENZIE^RAY^^^DR^^^AUSHICPR^L^^^UPIN~0191324T^MCINTYRE^ANDREW^^^DR^^^AUSHICPR^L^^^UPIN||||Dr Davidson
OBX|1|ST|15430-2^^LN||FULL BLOOD EXAMINATION||||||F
OBX|2|NM|718-7^Haemoglobin^LN||121|g/L|115-160||||F|||201512212329
OBX|3|NM|789-8^Red Cell Count^LN||3.8|x10*12/L|3.6-5.2||||F|||201512212329
OBX|4|NM|4544-3^Haematocrit^LN||0.38||0.33-0.46||||F|||201512212329
OBX|5|NM|787-2^Mean Cell Volume^LN||100|fL|80-98|+|||F|||201512212329
OBX|6|NM|785-6^Mean Cell Haemoglobin^LN||32|pg|27-35||||F|||201512212329
OBX|7|NM|777-3^Platelet Count^LN||393|x10*9/L|150-450||||F|||201512212329
OBX|8|NM|6690-2^White Cell Count^LN||8.8|x10*9/L|4.0-11.0||||F|||201512212329
OBX|9|NM|770-8^Neutrophils^LN||53|%|||||F|||201512212329
OBX|10|NM|751-8^Neutrophils^LN||4.7|x10*9/L|2.0-7.5||||F
OBX|11|NM|736-9^Lymphocytes^LN||30|%|||||F|||201512212329
OBX|12|NM|731-0^Lymphocytes^LN||2.6|x10*9/L|1.1-4.0||||F
OBX|13|NM|5905-5^Monocytes^LN||14|%|||||F|||201512212329
OBX|14|NM|742-7^Monocytes^LN||1.2|x10*9/L|0.2-1.0|+|||F
OBX|15|NM|713-8^Eosinophils^LN||3|%|||||F|||201512212329
OBX|16|NM|711-2^Eosinophils^LN||0.26|x10*9/L|0.04-0.40||||F
OBX|17|NM|706-2^Basophils^LN||0|%|||||F|||201512212329
OBX|18|NM|704-7^Basophils^LN||0.00|x10*9/L|< 0.21||||F
OBX|19|FT|5909-7^Interpretation^LN||Comment:\.br\Mild monocytosis and borderline high mean cell volume.  Other significant haematology parameters are within normal limits for age and sex.\.br\||||||F|||201512212329

 

When this message is received and Acknowledgement message is produced and returned to the laboratory.

ACK Message
MSH|^~\&|EQUATORDXTRAY^EQUATORDXTRAY:3.1.2^L|Demo Server^1FFA8984-7166-4655-B195-7B4FFFD2F136^GUID|EQUATORDXTRAY^EQUATORDXTRAY:3.1.2 (Build 6387) [win32-i386] {SVV=76;DBV=76}^L|QML^2184^AUSNATA|20160612150923+1000||ACK^R01|HOM06121509607-198|P|2.3.1^AUS&&ISO^AS4700.2&&L|||||AUS
MSA|AA|BGC06121502965-8968
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