Introduction. Thrombotic complications caused by the tumor and consequences of its treatment are the leading causes of death in cancer patients. The development of a model for the pathology of hemostasis, in particular the excessive pathological clot formation, in the laboratory animals receiving antitumor agents, could help find new pharmacological methods for correcting hemostatic disorders.The purpose of the study was to study the effect of cisplatin on the blood coagulation system in mice

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... d rats.Results. An experiment using outbred mice showed that the levels of PT-INR and aPTT were decreased and the level of fibrinogen was increased on day 10 after administration of cisplatin in the maximum tolerated dose of 10 mg/kg. A significant decrease in the PT-INR and aPTT levels was observed on day 15 after cisplatin injection only in female mice. The cisplatin injection at a dose of 4 mg/kg resulted in a decrease in the PT-INR, and aPTT levels and an increase in fibrinogen concentration on day 10. In rats, a significant decrease in the PT and aPTT levels was observed in both females and males on day 15 after cisplatin injection.Conclusion. A change in the PT and NIR, aPTT levels towards decrease and fibrinogen concentration towards increase indicates the initiation of thrombus formation.