1st April 2022

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 has abruptly stopped drinking alcohol as of 3-days ago as the pub he normally frequents has been closed. You suspect delirium tremens and arrange for a blood gas analysis and full blood, U&Es and blood gas analysis.

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