An IgA test measures the blood level of immunoglobulin A, one of the most common types

of antibodies in the body. Antibodies (also called immunoglobulins) are proteins the immune

system makes to recognize and get rid of germs.If your immunoglobulin levels are too high,

it may be a sign of an autoimmune disease, a chronic illness, an infection, or a type of

cancer. The IgA normal range differs with age and the IgA normal range for an healthy adult

is between 80 – 350 mg/dL.