The Lupus Anticoagulant test is a critical, specialized test to find the autoimmune root cause of unexplained blood clots or recurrent pregnancy loss. Despite its confusing name, this test detects an antibody that interferes with the blood clotting process in a test tube, but in your body, it actually increases your risk of forming dangerous clots. This test is a gold-standard, definitive marker for diagnosing Antiphospholipid Syndrome (APS). This is not a test for Lupus itself. It is the essential, conclusive test your doctor needs to find the why behind these serious events and create a plan to protect you.