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Background: At the present moment, an urgent and unresolved problem is the search for a method to diagnose disorders of the hemostasis system in patients with the new coronavirus infection. The integral tests, in particular, the thrombodynamics test, will presumably make it possible to monitor changes in blood clotting, and predict the course of the disease in patients with COVID-19.&#x0D;Aims: To comparatively assess the plasma hemostasis parameters and results of the thrombodynamics test in patients with COVID-19 viral infection of different severity.&#x0D;Methods: The study included 96 patients with a confirmed diagnosis of COVID-19, admitted to a hospital for infectious diseases on the base of the V.I. Kulakov National Medical Research Center for Obstetrics, Gynecology, and Perinatology in the period from April 23, 2020, to June 20, 2020, and discharged at the end of treatment. SARS-CoV-2 was identified by PCR. The patients were stratified by the severity into 3 groups: mild course (n=25), moderate course (n=54), severe course (n=17). The diagnostics and treatment of patients were carried out in accordance with the Temporary Methodological Recommendations of the Ministry of Health of the Russian Federation for the prevention, diagnosis and treatment of the new coronavirus infection, versions 5, 6, 7. In the course of the treatment, the patients were assessed for APTT, prothrombin %, prothrombin time (PT) and thrombin time, fibrinogen, D-dimer, platelet count, and the thrombodynamic test parameters (V/Vi/Vst, Tlag, Cs, D).&#x0D;Results: Significant differences were observed in the thrombin time, D-dimer, platelet count, and the thrombodynamic parameters of V/Vst, Cs, and D taken before admission and a week after admission. We found a relationship between the parameters of hemostasis (fibrinogen concentration, PT, prothrombin %, APTT, Tlag, D) and the duration of hospital stay. There was a positive relationship between the content of fibrinogen and D (r=0.6307, p 0.0001) and a strong positive relationship between PT and Tlag (r=0.7499, p 0.0001).&#x0D;Conclusions: The thrombodynamics test can be recommended as a potential tool for a personalized approach to monitoring the hemostasis system and treating patients with COVID-19.

The use of the thrombodynamics test in the diagnostics of hemostasis disorders in patients with COVID-19 of varying severity