Which statement best differentiates schizoaffective disorder from mood disorder with psychotic features?

Which statement best differentiates schizoaffective disorder from mood disorder with psychotic features?

• A. Mood symptoms present for the majority of the illness with no requirement for psychotic symptoms.
• B. There must be a period of psychosis without mood symptoms for at least 2 weeks.
• C. There must be a period of psychosis without mood symptoms for at least 2 weeks, with mood symptoms present for a substantial portion of the illness.
• D. Mood symptoms are present but do not dominate exclusively.

Answer: (C)

The main idea is that schizoaffective disorder blends psychotic symptoms with mood symptoms, but it also includes a period where psychosis occurs without mood symptoms, lasting at least two weeks. In schizoaffective disorder, mood symptoms are present for a substantial portion of the illness, yet there must be a clear stretch of psychosis in the absence of mood disturbance to show that the psychotic features can stand alone. This combination distinguishes it from mood disorders with psychotic features, where psychotic symptoms occur only during mood episodes and are not present on their own for a sustained period. Thus, the statement that captures this distinction is that there must be a period of psychosis without mood symptoms for at least two weeks, with mood symptoms present for a substantial portion of the illness. The other options either omit the isolated psychosis requirement or misstate the relationship between mood and psychotic symptoms.

The main idea is that schizoaffective disorder blends psychotic symptoms with mood symptoms, but it also includes a period where psychosis occurs without mood symptoms, lasting at least two weeks. In schizoaffective disorder, mood symptoms are present for a substantial portion of the illness, yet there must be a clear stretch of psychosis in the absence of mood disturbance to show that the psychotic features can stand alone. This combination distinguishes it from mood disorders with psychotic features, where psychotic symptoms occur only during mood episodes and are not present on their own for a sustained period.

Thus, the statement that captures this distinction is that there must be a period of psychosis without mood symptoms for at least two weeks, with mood symptoms present for a substantial portion of the illness. The other options either omit the isolated psychosis requirement or misstate the relationship between mood and psychotic symptoms.