Schizophrenia — Clinical Features

A 28-year-old man presents with a 3-month history of hearing voices commenting on his actions, belief that his thoughts are being broadcast to others, and disorganized speech. He has no prior psychiatric history. Which investigation is most appropriate to exclude organic causes before confirming a diagnosis of schizophrenia?

Which clinical feature best distinguishes schizophrenia from brief psychotic disorder in a 28-year-old man presenting with auditory hallucinations and disorganized speech?

A 32-year-old woman with a 5-year history of schizophrenia presents with prominent auditory hallucinations and paranoid delusions, but minimal negative symptoms. Which clinical feature best distinguishes her presentation as paranoid-type schizophrenia from the disorganized type?

A 32-year-old woman with a 2-year history of schizophrenia presents with persistent auditory hallucinations and negative symptoms despite adequate trials of two antipsychotics. Her compliance is confirmed. Which investigation is most appropriate to assess treatment resistance and guide further management?

A 32-year-old woman with a 5-year history of schizophrenia, currently on olanzapine 15 mg daily, presents with persistent auditory hallucinations, delusions of reference, and poor medication adherence. Her family reports she stopped taking medication 2 months ago. She denies suicidal or homicidal ideation. Mental status examination confirms active psychotic symptoms. What is the most appropriate next step in management?