APOH and Infertility: These data indicate an association between anti-β2GPI/HLA-DR antibodies and severe infertility and suggest the need for more investigations to determine whether LDA/UFH therapy may help restore fecundity in the antibody-positive group.The immunohistochemical study of the eutopic endometrium in the antibody-positive group showed the coordinated expression of β2GPI and HLA-DR antigens in the endometrium.