19th July 2023

A 34-year-old woman presents with a headache which she describes as the worst she’s ever had.

A 34-year-old woman presents with a headache which she describes as the worst she’s ever had. It came on suddenly and was severe within minutes. You suspect this patient has had a subarachnoid haemorrhage and arrange a CT head which is reported as normal.

What would be the next step in investigation?

Select the SINGLE most appropriate option from the list below. Select ONE option only.