[Bloody CSF: data analysis and clinical applications].

Bloody CSF in the lumbar puncture study is not uncommon. The etiology of bloody CSF is complex and needs to be carefully evaluated. This article will focus on (1) differentiation between causes from pathological conditions and traumatic puncture; (2) to ensure if the blooding has stopped or not, and if there is a rebleeding; (3) to estimate the amount of bleeding; and (4) to evaluate the number of white blood cells in the bloody CSF The above attempts may help clinicians to obtain an accurate picture of bloody CSF.