A 34-year-old woman, gravida 2, para 1, aborta 0, presents to the labor and delivery ward at 32 weeks' gestation with a 24-hour history of worsening frontal headache, photophobia, and neck stiffness. Vitals:
BP: 121/78 mm Hg
HR: 90 bpm
Temp: 38°C
Neuro exam reveals a 2-beat ankle clonus. Tone and power are otherwise normal. No localizing signs or papilledema. Abdomen is soft, fetus is cephalic.
Which one of the following is the best next investigation?
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