HL7 terms to better understand what is HL7. In the HL7 Standard, ACKs are acknowledgements. When the receiving application accepts and consumes the data within an HL7 message, the receiving application is expected to send an ACK back to the sending application. If the sending application does not receive the ACK, it may continue to send the same message until an ACK is received.
In HL7 messaging, most ACK messages have the same structure as outlined below.
MSH Message Header
MSA Message Acknowledgment
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