immune disorders
Selective Antibody Deficiency With Normal Immunoglobulins
Diagnosis
Blood tests to measure immunoglobulin levels and response to vaccines Children are not tested for this disorder until after age 2 years because young healthy children may have frequent sinus and lung infections and weak responses to certain vaccines. Testing consists of blood tests to measure levels of immunoglobulins and to evaluate how well the body produces immunoglobulins in response to vaccines. Normal levels of antibodies and an inadequate response to certain vaccines confirms the diagnosis. 