Used in research settings to detect and quantify IgG antibodies against β2-glycoprotein I in human serum or plasma. This assay helps investigate autoimmune responses associated with antiphospholipid syndrome (APS), particularly in patients with recurrent thrombosis or pregnancy complications. The kit supports clinical studies aiming to understand autoimmune mechanisms, assess disease activity, and evaluate risk of thrombotic events. It is not intended for diagnostic use but serves as a tool for immunological research and biomarker validation.