Decreased circulating immunoglobulin concentration 2008-02-20T03:34:00Z Immunoglobulin deficiency Decreased serum immunoglobulin Decreased circulating antibody level An abnormally decreased level of immunoglobulin in blood. SNOMEDCT_US:119250001 In humans, immunoglobulins comprise the five antibody isotypes IgA, IgD, IgE, IgG and IgM. UMLS:C0086438 HP:0010703 Hypogammaglobulinemia Reduced immunoglobulin levels HP:0004313 Decreased antibody level in blood UMLS:C4048270 Decreased immunoglobulin level Abnormal circulating immunoglobulin concentration