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In this Method Article we are showing the methodology for generation and purification of Anti-Beta 2 Glycoprotein I (β2GPI) antibodies. First β2GPI was purified from human plasma, and recognized by Western Blot and anti-β2GPI antibodies of serum from patients with antiphospholipid syndrome (APS). The C57BL/6 mice were immunized intraperitonealy with 150 μg of protein in adjuvant (β2GPI or bovine serum albumin) on days 1, 8 and 14. Then the anti-β2GPI antibodies were purified by affinity chromatography (Affi-Gel protein A sepharose) and affinity column using human β2GPI coupled to CNBr-activated Sepharose 4B. Titles of anti-β2GPI antibodies were determined by ELISA assays. • We purified β2GPI with great efficacy and that is recognized antigenically by serum from patients with SAP or an anti-β2gpi antibody. • We found that our purified antibody had 13 fold increased activity in ELISA test compared with the control and in Western Blot recognized with β2GPI (reference and purified). Method name: Generation and purification of Anti-Beta 2 Glycoprotein I antibodies, Keywords: Beta 2 glycoprotein I, Antibodies, Purification, Antiphospholipid syndrome