Table 2. CSF analysis and immunological workup.

CSF: cerebrospinal fluid, WBC: white blood cell count, PMN: polymorphonuclear leukocytes, PCR: polymerase chain reaction, HIV: human immunodeficiency virus, CH50: total hemolytic complement, IgG: immunoglobulin G, IgA: immunoglobulin A, IgM: immunoglobulin M

Diagnostic test	Patient value	Normal range	Interpretation/clinical significance
CSF color	Clear	Clear	Normal
CSF WBC	13	0-5/μL	Mild pleocytosis
CSF PMN %	11%	0%	Mildly elevated
CSF lymph %	89%	60-100%	Normal
CSF glucose	51	40-70 mg/dL	Normal
CSF protein	45	15-45 mg/dL	Normal
CSF culture	Sterile	Sterile	Negative
CSF PCR	Negative	Negative	Negative
HIV screening	Non-reactive	Non-reactive	Negative
Complement CH50​	42	30-60 U/mL	Normal
Serum IgG	840	450-1,150 mg/dL	Normal
Serum IgA	92	20-100 mg/dL	Normal
Serum IgM	112	40-160 mg/dL	Normal