Aim. The aim of the study is the improvement of assessment of intoxication in these patients by defining the relationship between mutual proportions of blood cells and the outcome of treatment. Materials and methods. We have performed an analysis of 80 cases of peritonitis, having studied their count of blood cells and the degree of autointoxication and the outcomes. Results. The most effective technique of assessment is use of the formula (Er>Kuligin А.V., Sadchikov D.V., Losev R.Z., Arkhangelsky S.M., Gromov M.S., Slonova M.M. The changes in proportion of blood cells in autointoxication caused by peritonitis // Saratov Journal of Medical Scientific Research, Vol. 8, Issue 1, 2012, pp. 57-59