Immunoassay for IgA (Serum/Plasma) Concentration

What Is Immunoglobulin A (IgA)?

IgA is a key part of your immune system, found in high concentrations in mucous membranes like your nose, throat, and digestive tract. It helps prevent harmful bacteria and viruses from entering your body. IgA can also be detected in blood, where it plays a role in immune response and inflammation. Levels can vary depending on health, immune status, and certain medical conditions.

Why Might You Need This Test?

Your doctor may order this test to check for low or high IgA levels, which can indicate conditions like immunodeficiency, autoimmune diseases, or certain infections. It may also be used in screening for conditions like IgA nephropathy (a kidney disease) or to monitor immune function in people with chronic illnesses.

When Could You Have Abnormal Results?

Low IgA levels may suggest a weakened immune system, while very high levels could be linked to certain autoimmune disorders or overactive immune responses. Your doctor will interpret results in the context of your overall health and symptoms.

Common Reasons for Testing

Tests for IgA concentration are often done when symptoms like frequent infections, digestive issues, or unexplained rashes are present. Doctors may also recommend it for people with a family history of immune-related conditions or those undergoing certain treatments that affect immunity.