13th August 2024

A 64-year-old man presents to A&E 2 hours after experiencing a sudden onset severe occipital headache

A 64-year-old man presents to A&E 2 hours after experiencing a sudden onset severe occipital headache. He also reports photophobia and neck stiffness. He has a history of ischaemic heart disease and a coronary artery bypass graft 2 years ago.

Investigations show:


Hb 139 (135-180)	Na 131 (135-145)	Creatinine 71 (45-84)
WBC 10.1 (4-11)	K+ 3.9 (3.5-5)	Glucose 13.6
Leucocytes 1.4 (1-3.5)	Urea 4.2 (4-7)	Non-contrast CT brain: normal

Which investigation should be performed next?

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

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