By way of comparison the International HL7 2.4 standard has the following message structure which is varied by the Australian localisation (See section 1.7).
International ORU Message Structure
ORU^R01 Unsolicited Observation Message
MSH Message Header
{
[
PID Patient Identification
[PD1] Additional Demographics
[{NK1}] Next of Kin/Associated Parties
[{NTE}] Notes and Comments
[
PV1 Patient Visit
[PV2] Patient Visit - Additional Info
]
]
{
[ORC] Order common
OBR Observations Report ID
{[NTE]} Notes and comments
[CTD] Contact Data
{
[OBX] Observation/Result
{[NTE]} Notes and comments
}
[{FT1}] Financial Transaction
{[CTI]} Clinical Trial Identification
}
}
[DSC] Continuation Pointer