Is it true that each trigger event is associated with only one message type?

The statement is true because in the context of HL7 messaging, each trigger event is indeed designed to correlate with a specific message type. Trigger events act as the stimuli that initiate the transmission of messages within the healthcare information exchange framework. Each event encapsulates a particular situation or action that requires communication, such as the admission of a patient or the update of a laboratory result.

HL7 defines a standardized set of trigger events that are explicitly mapped to unique message types, ensuring clarity and consistency in data exchange. For instance, a patient admission event triggers a specific message type (such as ADT^A01), which contains all relevant information pertinent to that event. This relationship between trigger events and message types is fundamental to maintaining structured communication in healthcare systems.

Thus, the association of each trigger event with only one message type promotes interoperability among disparate healthcare systems, facilitating accurate and efficient information sharing.