Purpose To assess whether a panel of serum pemphigoid autoantibody tests could be used to confirm an immunopathologic diagnosis mucous membrane (MMP) in direct immunofluorescent negative (DIF–) MMP patients. Design Prospective cross-sectional study. Participants Seventy-six patients with multisite 45 matched control participants. Methods Enzyme-linked immunosorbent assays (ELISAs) for BP180 and...