Used in research settings to detect and quantify antibodies targeting the first domain of human β2-glycoprotein 1, this ELISA kit is particularly valuable in studying antiphospholipid syndrome (APS). It enables specific measurement of anti-β2GPDI antibodies, which are strongly associated with thrombotic events and autoimmune responses. The assay supports improved diagnostic accuracy by differentiating pathogenic antibodies from those directed against other domains of β2-glycoprotein 1. It is widely used in clinical research and autoimmune disease studies to assess disease activity, monitor treatment response, and investigate the role of domain-specific antibodies in thrombosis and pregnancy complications.