Donated blood plasma. Medical staff member holding a bag of type AB Positive blood plasma for use in a transfusion. Blood transfusions are used to treat various blood disorders and to treat blood loss during surgery or after an accident. Blood plasma is the fluid in which the blood cells are suspended. It consists of a solution of inorganic salts with a high concentration of proteins, along with fats, glucose, hormones and clotting factors. Plasma transfusions are used to treat patients with deficiencies in plasma components or those with abnormally high concentrations of plasma-bound agents.