The estimation of protein in the cerebrospinal fluid using the M.R.C. photometer.

Turbidometric methods are widely emp!oyed for the estimation of protein in cerebrospinal fluid (C.S.F.). Precipitation is generally effected using salicylsulphonic acid, and subsequent comparison made with standard reference tubes, e.g., of the formazin gelatin type (King, 1951a). Unfortunately these suffer "ageing," and matching in artificial light is often difficult. The following technique has been employed in this laboratory for the past two years.