A 40-year-old man presents with new-onset psychosis, including auditory hallucinations and delusions, for 3 months. There is no prior psychiatric hist...

Question

A 40-year-old man presents with new-onset psychosis, including auditory hallucinations and delusions, for 3 months. There is no prior psychiatric history, and he uses no substances. Physical and neurological examinations are normal. Which investigation is most essential before confirming a primary psychotic disorder?

Accepted Answer

Comprehensive metabolic and toxicology screening including CBC, electrolytes, liver and renal function, and thyroid tests

Answer

EEG

Answer

Brain MRI in all cases

Answer

Lumbar puncture in all patients

Answer

None; primary psychosis is a clinical diagnosis needing no investigations

ca-mccqe1 MCQ (SBA): First-episode psychosis workup