What term refers to an observable fact or event in a healthcare context?

The term that best refers to an observable fact or event in a healthcare context is "phenomenon." This term encompasses any situation or occurrence that can be observed and often studied scientifically. In healthcare, phenomena may include a variety of medical occurrences, symptoms, or patterns of behavior that can be documented and analyzed to improve patient care and health outcomes.

While "observation" also pertains to the act of noticing or monitoring, it is more about the process itself rather than the fact or event being noted. "Incident" typically describes a specific occurrence that may present a problem or a negative event, often relating to safety issues or complications. "Event log" refers to a systematic record of occurrences, but it does not convey the broader scientific implications associated with observable facts. Therefore, "phenomenon" is the most comprehensive and suitable term in this context.