Which factor determines whether a client who presents with symptoms of psychosis and disordered mood meets criteria for schizoaffective disorder?

Choice A reason: To meet DSM-5 criteria for schizoaffective disorder, the client must experience delusions or hallucinations for ≥ 2 weeks in the absence of a major mood episode (depressive or manic) during the lifetime duration of the illness. This distinction is critical to differentiate it from mood disorders with psychotic features. Choice B reason: The presence of mania determines the subtype of schizoaffective disorder (bipolar type), but it is not the factor that establishes the diagnosis of schizoaffective disorder itself. Both bipolar and depressive subtypes exist; therefore, mania is not a universal requirement for the diagnosis of the underlying schizoaffective pathology. Choice C reason: While hallucinations are a symptom of psychosis, their presence alone does not distinguish schizoaffective disorder from schizophrenia or a mood disorder with psychotic features. The diagnosis hinges on the temporal relationship between these psychotic symptoms and the presence or absence of the mood episodes throughout the disease course. Choice D reason: Depressive symptoms are common in many psychiatric conditions, including major depressive disorder with psychotic features and schizophrenia. Like mania, the presence of depressive symptoms helps categorize the subtype but does not serve as the defining longitudinal factor that establishes a diagnosis of schizoaffective disorder over other psychotic illnesses.