24th August 2020

A 42-year-old man with a history of heavy alcohol consumption presents to the emergency department

A 42-year-old man with a history of heavy alcohol consumption presents to the emergency department with agitation, hallucinations and nausea and vomiting. Though he is incoherent and confused, you manage to gather that he abruptly stopped drinking alcohol 3-days ago, as the pub he normally frequents has been closed. You suspect delirium tremens and arrange for a full blood count and U&Es to be performed.

Select the SINGLE most appropriate investigation from the list below to order next. Select ONE option only.