TPO and syphilis: Serum studies demonstrated normal antinuclear antibodies (ANA), thiamine, anti-Ro, anti-La, thyroid stimulating hormone (TSH), free T3/free T4 (fT3/T4), thyroid peroxidase (TPO) and thyroglobulin (TG) antibodies, syphilis screen, borrelia IgG/IgM antibodies, C-reactive protein (CRP).