The normal ratio for lupus anticoagulant is 0.8 to 1.2. Lupus anticoagulant is an antibody that prolongs the clotting time and is either an immunoglobulin G or immunoglobulin M type antibody. Lupus anticoagulant binds to phospholipids and phospholipid-protein complexes and interferes with the phospholipid-dependent coagulation process in coagulation tests in vivo and in vitro. Abnormal lupus anticoagulant ratios can be seen in blood tests of patients with a variety of autoimmune diseases, such as systemic lupus erythematosus, antiphospholipid antibody syndromes, other immune-autoimmune disorders (e.g., rheumatoid arthritis, etc.), recurrent miscarriages, arterial and venous embolisms, and malignant tumors. Therefore, when an abnormal lupus anticoagulant ratio exists in a normal person, thrombocytopenia, prolonged clotting time, or corresponding hematologic malignancies, as well as arteriovenous thrombosis or a combination of other autoimmune diseases may occur. If the test finds that the lupus anticoagulant ratio is abnormal, it is necessary to go to the hospital in time, and carry out symptomatic treatment after clarifying the cause of the disease, in order to prevent serious consequences.