IgA is an antibody that helps protect mucosal surfaces, including the respiratory and digestive tracts. It is also found in saliva and tears.

Why would IgA be low?

Low IgA can be associated with selective IgA deficiency, one of the more common antibody deficiencies, among other causes. A provider interprets the result.

Usually no special preparation is needed for an immunoglobulins blood test. Quest did not capture a prep instruction. Follow the requisition and collection-site instructions.

Is this the same as the IgA, IgG, IgM panel?

No. This order measures IgA alone. The broader panel measures three immunoglobulin classes together.

Immune health

Immunoglobulin A (IgA) Blood Test

A blood test that measures immunoglobulin A, an antibody that helps protect the respiratory and digestive tracts.