A simple, fast method for the measurement of serum α1-antichymotrypsin by an immunoturbidimetric technique is described. The assay spans the range 0·21 g/L to 2·83 g/L which covers adequately the majority of concentrations encountered in normal and pathological sera. The precision is good and the accuracy acceptable, as judged by a comparison with an electroimmunoassay technique. A reference range has been obtained using samples collected from blood donors.
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