Depends on the story. According to boards, yes you need an LP or CTA if headache is concerning for SAH & >6 hrs. Blood is found in subarachnoid space 92% of time if <24 hrs. If CT head scan done <6 hrs, sens is ~100%. Critical caveats: the CT scanner is a 7th gen (latest) model
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Modern CTA has more or less replaced LP
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