A 27-year-old man with no previous psychiatric history is brought to hospital by his family after two weeks of little sleep, expansive business plans and increasingly disorganised speech. He has been taking tablets obtained from a gym and says they contain a ‘pre-workout hormone’; he also uses cannabis most evenings. He is hearing voices and cannot give a reliable account of when they began. Which one of the following is the most appropriate initial investigation?
Keep going — a set of ten like this one, one at a time.
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