Annotation. The prognostic criteria of complications of community-acquired pneumonia and the possibility of developing disorders of the hepatobiliary system (HBS) depending on the concentration in the serum of the secretory leukocyte protease inhibitor (SLPI) were studied. The data of clinical and laboratory examination of 338 children with community-acquired pneumonia aged from one to three years were analyzed. Statistical processing of the results was performed using the system “IBM SPSS Statistica” 12 using parametric and non-parametric methods. It was found that in young children with pneumonia in the serum increases the concentration of SLPI, the level of which depends on the course and severity of pneumonia. It has been shown that the development of lobar pneumonia is significantly higher in patients from the SLPI cohort IV quartile (OR – 1.986, 95% CI – 1.864-2.356), compared with children from the cohort SLPI II and III quartile (OR – 0.476, 95% CI – 0.405- 0.559, OR – 0.494, 95% CI – 10.423-0.576, respectively). At the same time, at the values of SLPI at the level of III-IV quartile (OR – 1.923, 95% CI – 1.457-1.866) there is the development of community-acquired pneumonia. It was found that the development of pathological processes in the organs of HBS is associated with increased levels of SLPI. Thus, patients with polysegmental pneumonia and SLPI III/IV quartile (OR – 2.190, 95% CI – 1.810-2,754) are twice as likely to develop pathology of the hepatobiliary system than children with SLPI I/II quartile (OR – 1.153, 95% CI – 1.071-1.527). The established fact indicates the involvement of SLPI in the pathogenesis not only of pneumonia, but also in disorders of HBS.