Test Details: Immunohistochemical testing helps to identify specific antigens (proteins) within tissue sections utilizing an antigen-specific antibody. Antibody to IgG is useful in the identification of plasma cells, lymphoid cells containing IgG and classifying B-cells neoplasms. IHC IgG is used in evaluation of autoimmune liver conditions-autoimmune hepatitis, primary biliary cirrhosis and primary sclerosing cholangitis.