9th day syndrome is the conventional name for hemostasis disorders that occur within 9 days after surgery or childbirth. These disorders are usually associated with bleeding occurring during surgery or childbirth; however, in contrast to hemorrhagic shock, these disorders do not involve disturbances in central or peripheral hemodynamics. After surgery, temporary anemia often occurs, especially if the operation was extensive and lengthy. During this period, conditions are created for the activation of the blood coagulation system, and therefore the level of platelets in the blood increases. The hematological sign of day 9 syndrome is a decrease in the level of venous platelets and leukocytes. Quantity