Lupus anticoagulant has been found to be present in a variety of diseases. The persistence of lupus anticoagulant substances is considered to be a red flag for unexplained recurrent miscarriage, stillbirth, fetal growth retardation, arteriovenous thrombosis, various thrombophilic diseases, and certain autoimmune diseases. Antithrombin III (antithrombin, AT III) is one of the most important anticoagulant substances in the human body. It maintains the balance of blood coagulation in the body.