The IgG/IgM Antibody Serology test looks for both IgG and IgM antibodies to B. burgdorferi. IgM antibodies are present shortly after infection. IgG antibodies often persist long after symptoms have disappeared. A positive or equivocal test should be confirmed by both IgG and IgM ImmunoBlots. This test is recommended at least four weeks after exposure. This test is unavailable for patients over 65 when ordered through physician services.