Immunoglobulin G and immunoglobulin G subclass concentrations differ according to sex and race

Background Serum immunoglobulin G (IgG) concentrations are integral to the workup of immune deficiencies and IgG4-related disease (IgG4-RD). Demographic differences in IgG concentrations are poorly described but can influence test interpretation, contribute to racial disparities in primary immunodeficiency diagnosis, and explain demographic differences in IgG concentrations in IgG4-RD. Objective To assess differences in IgG and IgG subclass...