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INTRODUCTION Ravulizumab (ALXN121 is a long-lasting recycling IgG monoclonal antibody with an increased affinity for the neonatal Fc receptor (FcRn). The FcRn is essential for regulating IgG homeostasis. Saturation of the FcRn pathway is seen under high IgG doses as they compete with endogenous IgG to bind the FcRn by their Fc regions, resulting in enhanced IgG clearance. PATIENTS/METHODS Between Jan 2016 and Jun 2019 (median observation time 21.6 months (6-37.7 months)) serum IgG concentrations and IgG1-4 subclasses were evaluated o