Anti-Beta 2 Glycoprotein I IgG (anti-β2GPI IgG) is a quantitative assay for determination of anti-β2GPI IgG antibodies relative to antiphospholipids syndrome (APS) in human serum or plasma.

The ENDO-APS-HR assay is the only fully standardized and most sensitive ELISA for anti-β2GPI IgG available for human research.