label: Immunoglobulin A Deficiency 1
label_lc: immunoglobulin a deficiency 1
description: Decreased or absent levels of serum immunoglobulin A, with normal serum levels of immunoglobulin G and immunoglobulin M in a patient who is older than 4 years of age and in whom all other causes of hypogammaglobulinemia have been excluded. Affected individuals may be asymptomatic or have frequent infections, allergic reactions, or autoimmune disorders.