IgA (immunoglobulin A) is an antibody that plays a crucial role in mucosal immunity, protecting the surfaces of the mouth, airways, digestive tract, and urinary tract from infections.
Category: Inflammation & Immune
Also known as: iga, immunoglobulin a, serum iga
Reference range: 70–400 mg/dL (Source: ABIM)
Standard unit: mg/dL
High values may indicate
High IgA levels may indicate IgA myeloma (multiple myeloma), chronic infections, liver cirrhosis, autoimmune diseases, or IgA nephropathy.
Low values may indicate
Low IgA levels may indicate selective IgA deficiency (the most common immunodeficiency), common variable immunodeficiency, or conditions causing protein loss such as nephrotic syndrome.