A 91-year-old man with moderate dementia is admitted after a fall and has developed new agitation overnight. He is afebrile, oxygen saturation is 96% on room air and there is no focal neurological deficit. His regular medicines include oxycodone, oxybutynin and zopiclone, and his urinalysis shows leukocytes but he has no urinary symptoms. Which investigation is most appropriate before prescribing an antipsychotic?
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