Which lab tests are performed when a CNS infection is the suspected cause of delirium, dementia, and amnesia?

Updated: Sep 19, 2018
  • Author: Richard D Shin, MD; Chief Editor: Gil Z Shlamovitz, MD, FACEP  more...
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In suspected CNS infection, the following may be ordered:

  • Lumbar puncture may be done for CSF studies, including cryptococcal antigen, Lyme disease and VDRL.

  • CT scan of head should be done before lumbar puncture to rule out toxoplasmosis or abscess, especially in patients with HIV who present with headache.

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