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HL7 V2 | TRIGGER EVENT U04

SSR^U04: specimen status request

specimen status request. It's sent as a SSR message (Specimen status request message) with the SSR_U04 message structure.

Message type
SSR · Specimen status request message
Trigger event
U04
Message structure
SSR_U04 · per HL7's current table 0354; older versions sometimes paired events differently
In MSH-9
SSR^U04^SSR_U04
Response
ACK · General acknowledgment message

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.