Objective. Estimate baseline coagulation profile values in patients scheduled for cardiosurgical intervention in age groups of pediatric population.Material and methods. The coagulation profile was analyzed in a complete selection of patients admitted to the intensive care department of Scientific Research Institute – Ochapovsky Regional Clinical Hospital #1 for the period from January to December 2018. The study includes 842 patients planned for cardiac surgery.Results. This study demonstrates the dependence of the basic parameters of the hemostasis system on age characteristics, mainly during the period of the first year of life. APPT values were similar in all age groups, whereas extended PV was recorded in patients less than one year.Conclusion. Evaluation of coagulation system parameters should be based on age-specific reference values. Understanding the concept of developing hemostasis is extremely important in conditions of optimal prevention, diagnosis and treatment of hemorrhagic and thrombotic conditions in the pediatric population.