How many core symptoms must be present to meet the diagnostic criterion for schizophrenia?

• A. One
• B. Three
• C. Two or more
• D. Four

Answer: (C)

Schizophrenia diagnosis relies on a threshold of multiple prominent symptoms rather than a single odd experience. To meet the criteria, a person must show two or more of a defined set of core symptoms during an active phase, with at least one of those symptoms being delusions, hallucinations, or disorganized speech. This two-or-more rule helps distinguish schizophrenia from conditions with a single psychotic symptom or other disorders with psychosis. In addition, symptoms must be present for a substantial period (at least 6 months, with at least 1 month of active symptoms) and cause significant social or occupational dysfunction. So, the minimum number of core symptoms required is two or more.