Sterile meningitis
For any patient with meningitis, it is important to perform a lumbar puncture ("spinal tap"), in which a sample of spinal fluid (known as cerebrospinal fluid, or CSF) is taken for testing.
Tests may include:
Swartz MN. Meningitis: bacterial, viral, and other. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsever; 2007: chap 437.