How far back into the laboratory system will the acknowledgement message (NHSACK) go?
The objective of the acknowledgment message is to minimise the possibility of message loss going unrecognised by enabling unacknowledged messages to be highlighted. This is accomplished by reconciling information in received acknowledgment messages with information in the audit trail and the provision of functions that enable exceptions (i.e. unacknowledged messages) to be highlighted. The specification that describes the functional requirements in this area cannot be prescriptive with respect to the part of the system (pathology system or middleware) in which such functionality should reside. Ideally, acknowledgment information would go right back to the original data source, but this cannot be mandated as it depends on the extent of integration that might be provided between potentially disparate pathology and EDI systems. Nevertheless, the ability to keep track of messages needs to be easily accessible to those laboratory users whose job it will be to monitor messaging. Laboratories
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