B2 Glycoprotein I IgM analysis (B2 Glycoprotein I IgM in serum) is a test used to measure IgM antibodies against B2 glycoprotein I. These antibodies are indicators of coagulation disorders such as antiphospholipid antibody syndrome, which increases the risk of blood clots. This test helps physicians assess the potential risk of clotting problems and guide appropriate treatment options for patients with a history of thrombosis or recurrent miscarriages.