B2 Glycoprotein I IgG analysis (B2 Glycoprotein I IgG in serum) is a test used to measure the levels of antibodies against B2 glycoprotein I, a protein involved in blood clotting. Elevated levels of these antibodies can indicate coagulation disorders such as antiphospholipid antibody syndrome. This test helps physicians assess the risk of blood clots and guide appropriate treatment for patients with recurrent clotting issues.