OML^O33: Laboratory order for multiple orders related to a single specimen

Laboratory order for multiple orders related to a single specimen. It's sent as an OML message (Laboratory order message) with the OML_O33 message structure.

Message type

OML · Laboratory order message

Trigger event

O33

Message structure

OML_O33 · per HL7's current table 0354; older versions sometimes paired events differently

In MSH-9

OML^O33^OML_O33

Source: HL7 Terminology (THO) 7.4.0, published by HL7 International under CC0. Check your trading partner's specification for the values they actually send.