The Anti-Phospholipid Antibody, IgG test measures the level of IgG antibodies that target phospholipids, components of cell membranes involved in blood clotting. High levels of these antibodies are commonly associated with antiphospholipid syndrome (APS), a disorder that increases the risk of blood clots, recurrent miscarriages, and other complications like stroke or deep vein thrombosis (DVT). This test is essential for diagnosing APS, especially in individuals with unexplained blood clots or pregnancy-related issues. A blood sample is required for this test to assess the risk of clotting.