Micromixing is a way of expressing the transparency of cerebrospinal fluid (CSF), which is usually expressed in three ways: clear, slightly mixed and turbid in laboratory tests. Normal cerebrospinal fluid is colorless and transparent, while slightly cloudy cerebrospinal fluid is indicated by slightly turbid cerebrospinal fluid. When inflammation, tumors, and other diseases of the central nervous system occur, an increase in the number of cells or bacteria in the cerebrospinal fluid will cause a change in the transparency of the cerebrospinal fluid, which will be indicated by slightly cloudy or turbid cerebrospinal fluid. In purulent meningitis, the number of cells in the cerebrospinal fluid is significantly elevated, and the transparency of the cerebrospinal fluid is indicated as turbid. In tuberculous meningitis, the cell count is moderately increased, and the clarity can be characterized as slightly cloudy. An increase in red blood cells brought in by a puncture injury can also cause the cerebrospinal fluid to be slightly cloudy in color clarity.