Analysis in patients with active PTB showed anemia, leucocytosis, thrombocytosis, elevation in plasma fibrinogen, factor VIII, plasminogen activator inhibitor 1 (PAI-1) with depressed antithrombin III (AT III) and protein C (PC) levels. On the 30th day of treatment, anemia, leucocytosis and thrombocytosis were improved. With the development of tuberculosis against the background of pronounced immunodeficiency and the predominance of the exudative nature of inflammation with damage to the microhemocirculatory bed of the lungs, a significant deposition of fibrin in the inflammatory zone becomes possible. On the 30th day of treatment, anemia, leucocytosis and thrombocytosis were improved. Fibrinogen and factor VIII levels had decreased to normal levels, PC and AT III levels had increased to normal levels, and there was no difference in PAI-1 levels. We found no activated protein C resistance. Platelet aggregation studies demonstrated increased platelet activation. However, DVT was not detected in patients during the follow-up period.