Replacement therapy in adults, children and adolescents (0-18 years) in: - Primary immunodeficiency syndromes with impaired antibody production (see section 4.4). - Secondary immunodeficiencies (SID) in patients who suffer from severe or recurrent infections, ineffective antimicrobial treatment and either proven specific antibody failure (PSAF)* or serum IgG level of <4 g/l. *PSAF = failure to mount at least a 2-fold rise in IgG antibody titre to pneumococcal polysaccharide and polypeptide antigen vaccines. Immunomodulatory therapy in adults, children and adolescents (0-18 years): - Hizentra is indicated for the treatment of patients with chronic inflammatory demyelinating polyneuropathy (CIDP) as maintenance therapy after stabilization with IVIg.