Routine examination of cerebrospinal fluid includes the cell count, protein, sugar and chloride of cerebrospinal fluid. The normal values of these indicators are as follows: 1. The white blood cell count of cerebrospinal fluid in normal people is (0-5) × 10^6 /mL, and it is mostly single nucleated cells; 2. The normal content of cerebrospinal fluid protein is 0.15-0.45g/L; 3. The sugar content of cerebrospinal fluid also depends on the blood sugar level, but most The normal value is 2.5-4.4 mmol/L; 4. The normal value of cerebrospinal fluid chloride is 120-130 mmol/L. Based on these routine monitoring indicators, we can probably determine the specific disease process and determine which kind of infection it belongs to.