You want to assess a patient for features of narcissistic personality disorder during an interview, without simply labelling them as arrogant. Before revealing the answer, decide what you would actually explore.

Ask about the person's own account of their achievements and abilities, listening for grandiosity, and also for how they respond when this self-image is challenged. Explore how they describe their close relationships — what they feel they gain from them, and how they respond to a partner's own needs. Since some egocentricity is common across several personality disorders, assess it alongside the other features here (entitlement, fragile self-esteem, exploitativeness) rather than treating egocentricity alone as diagnostic, and note how the person responds to setbacks or criticism, since fragility beneath outward confidence is a recognised feature.