The lupus anticoagulant test is a lupus anticoagulant test, in which lupus anticoagulant is a heterogeneous immunoglobulin that interferes with the phospholipid-dependent coagulation process and prolongs the clotting time. The lupus anticoagulant test is performed mainly to identify fetal abnormalities of unknown origin, to assist in the diagnosis of embolic and autoimmune diseases, etc. It can also be used for the evaluation of prothrombin time. The lupus anticoagulant test can be used mainly for the occurrence of habitual abortion, fetal growth retardation and unexplained fetal death in the middle and late stages of pregnancy, etc. In addition, it can also be used to diagnose arteriovenous embolism, thrombocytopenia, cerebral infarction and atherosclerosis in thrombophilia, etc. The test for immune diseases is commonly used to diagnose systemic lupus erythematosus, rheumatoid arthritis and aortitis, etc. It can also be used for prothrombin Time evaluation, prolonged prothrombin time can reflect the presence of allergic purpura, liver damage and other diseases in the body. A positive test result for lupus anticoagulant substance means that the patient may have the relevant disease and needs to start the relevant treatment in time, but there is also the possibility of false positive, such as syphilis patients may also show positive performance in the test. If the test is positive, patients are generally advised to repeat the test in a few weeks to ensure the accuracy of the results. Fasting is required before performing a lupus anticoagulant test to ensure the quality of the specimen and to improve the accuracy of the test.