CSF analysis with over 5 WBC is infectious
- related: lumbar puncture CSF analysis
- tags: #permanent #neurology
- source: Nujud neuro ICU
CSF should have less than 5 WBC. CSF with over 5 WBC should be considered as infectious.
CSF RBC to WBC ratio is 750-1000 to 1. This means for every 1000 RBC, it's ok to have one more WBC.
CSF analysis with SAH has xanthochromia
Interestingly, in one study, a WBC/RBC ratio not exceeding 0.01 has almost 100% negative predictive value for meningitis.