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EasyLP is recommended to evaluate for xanthochromia/CSF RBCs when SAH is within the time window; CTA may detect aneurysm but cannot exclude SAH alone. Discharge is unsafe; empiric nimodipine without diagnosis is inappropriate."Neurology"easy"

A 52-year-old man presents with thunderclap headache, normal neuro exam; CT head is negative. You suspect subarachnoid hemorrhage within 6 hours of onset. Next best diagnostic step?

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