Which scenario would be considered a sentinel event?

• A. A patient experiences a minor allergy that is resolved quickly.
• B. A patient misses a scheduled test.
• C. An unexpected occurrence involving death or serious injury requiring immediate investigation.
• D. A patient requests a second opinion.

Answer: (C)

Sentinel events are unexpected occurrences involving death or serious injury (or the risk of either) that require immediate, formal investigation. They point to potential flaws in care processes and prompt a root-cause analysis and corrective actions to prevent recurrence.

In the given scenario, death or serious injury occurs and requires urgent inquiry, which fits the definition of a sentinel event. The other scenarios involve less severe outcomes or routine situations and do not meet this threshold.